Aviation Pioneer

When Aviation Pioneer enters the battlefield, create a 1/1 colorless Thopter artifact creature token with flying.

Have

Bulwark Giant

When Bulwark Giant enters the battlefield, you gain 5 life.

Coral Barrier

Defender (This creature can't attack.)
When Coral Barrier enters the battlefield, create a 1/1 blue Squid creature token with islandwalk. (It can't be blocked as long as defending player controls an Island.)

Thraben Inspector

When Thraben Inspector enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Enlightened Ascetic

When Enlightened Ascetic enters the battlefield, you may destroy target enchantment.

Hunting Drake

Flying
When Hunting Drake enters the battlefield, put target red or green creature on top of its owner's library.

Kor Hookmaster

When Kor Hookmaster enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Trinket Mage

When Trinket Mage enters the battlefield, you may search your library for an artifact card with mana value 1 or less, reveal that card, put it into your hand, then shuffle.

Siren Lookout

Flying
When Siren Lookout enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Breaching Hippocamp

Flash (You may cast this spell any time you could cast an instant.)
When Breaching Hippocamp enters the battlefield, untap another target creature you control.

Spire Owl

Flying
When Spire Owl enters the battlefield, look at the top four cards of your library, then put them back in any order.

Sandcrafter Mage

When Sandcrafter Mage enters the battlefield, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

Aven Eternal

Flying
When Aven Eternal enters the battlefield, amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Paladin of the Bloodstained

When Paladin of the Bloodstained enters the battlefield, create a 1/1 white Vampire creature token with lifelink.

Arashin Cleric

When Arashin Cleric enters the battlefield, you gain 3 life.

Dwarven Priest

When Dwarven Priest enters the battlefield, you gain 1 life for each creature you control.

Stonehorn Dignitary

When Stonehorn Dignitary enters the battlefield, target opponent skips their next combat phase.

Chillbringer

Flying
When Chillbringer enters the battlefield, tap target creature an opponent controls. It doesn't untap during its controller's next untap step.

Lone Missionary

When Lone Missionary enters the battlefield, you gain 4 life.

Voidwielder

When Voidwielder enters the battlefield, you may return target creature to its owner's hand.

Gallant Cavalry

Vigilance (Attacking doesn't cause this creature to tap.)
When Gallant Cavalry enters the battlefield, create a 2/2 white Knight creature token with vigilance.

Monk Realist

When Monk Realist enters the battlefield, destroy target enchantment.

Aven Tactician

Flying
When Aven Tactician enters the battlefield, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

Sensor Splicer

When Sensor Splicer enters the battlefield, create a 3/3 colorless Phyrexian Golem artifact creature token.
Golem creatures you control have vigilance.

Lagonna-Band Elder

When Lagonna-Band Elder enters the battlefield, if you control an enchantment, you gain 3 life.

Sky-Eel School

Flying
When Sky-Eel School enters the battlefield, draw a card, then discard a card.

Inkfathom Divers

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
When Inkfathom Divers enters the battlefield, look at the top four cards of your library, then put them back in any order.

Primal Clay

As Primal Clay enters the battlefield, it becomes your choice of a 3/3 artifact creature, a 2/2 artifact creature with flying, or a 1/6 Wall artifact creature with defender in addition to its other types. (A creature with defender can't attack.)

Suture Priest

Whenever another creature enters the battlefield under your control, you may gain 1 life.
Whenever a creature enters the battlefield under an opponent's control, you may have that player lose 1 life.

Pilgrim's Eye

Flying
When Pilgrim's Eye enters the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Soul Warden

Whenever another creature enters the battlefield, you gain 1 life.

Ancestral Statue

When Ancestral Statue enters the battlefield, return a nonland permanent you control to its owner's hand.

Canal Courier

When Canal Courier enters the battlefield, you become the monarch.
Whenever Canal Courier and another creature attack different players, Canal Courier can't be blocked this combat.

Disposal Mummy

When Disposal Mummy enters the battlefield, exile target card from an opponent's graveyard.

Senate Griffin

Flying
When Senate Griffin enters the battlefield, scry 1.

Prying Blade

Equipped creature gets +1/+0.
Whenever equipped creature deals combat damage to a player, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Wormfang Drake

Flying
When Wormfang Drake enters the battlefield, sacrifice it unless you exile a creature you control other than Wormfang Drake.
When Wormfang Drake leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Keymaster Rogue

Keymaster Rogue can't be blocked.
When Keymaster Rogue enters the battlefield, return a creature you control to its owner's hand.

Aven Riftwatcher

Flying
Vanishing 3 (This creature enters the battlefield with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When Aven Riftwatcher enters or leaves the battlefield, you gain 2 life.

Owl Familiar

Flying
When Owl Familiar enters the battlefield, draw a card, then discard a card.

Cloud of Faeries

Flying
When Cloud of Faeries enters the battlefield, untap up to two lands.
Cycling {2} ({2}, Discard this card: Draw a card.)

Courier Griffin

Flying
When Courier Griffin enters the battlefield, you gain 2 life.

Cloudchaser Kestrel

Flying
When Cloudchaser Kestrel enters the battlefield, destroy target enchantment.
{W}: Target permanent becomes white until end of turn.

Telepathic Spies

When Telepathic Spies enters the battlefield, look at target opponent's hand.

Getting

Soulherder

Whenever a creature is exiled from the battlefield, put a +1/+1 counter on Soulherder.
At the beginning of your end step, you may exile another target creature you control, then return that card to the battlefield under its owner's control.

Isperia's Skywatch

Flying
When Isperia's Skywatch enters the battlefield, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

Ash Barrens

{T}: Add {C}.
Basic landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Sailor of Means

When Sailor of Means enters the battlefield, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Corpse Cur

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
When Corpse Cur enters the battlefield, you may return target creature card with infect from your graveyard to your hand.

Azorius Guildgate

Azorius Guildgate enters the battlefield tapped.
{T}: Add {W} or {U}.

Sage Aven

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Sage Aven enters the battlefield, look at the top four cards of your library, then put them back in any order.

Totem-Guide Hartebeest

When Totem-Guide Hartebeest enters the battlefield, you may search your library for an Aura card, reveal it, put it into your hand, then shuffle.

Scholar of Stars

When Scholar of Stars enters the battlefield, if you control an artifact, draw a card.

Ironclad Slayer

When Ironclad Slayer enters the battlefield, you may return target Aura or Equipment card from your graveyard to your hand.

Plains

Iron Bully

Menace (This creature can't be blocked except by two or more creatures.)
When Iron Bully enters the battlefield, put a +1/+1 counter on target creature.

Fogwalker

Skulk (This creature can't be blocked by creatures with greater power.)
When Fogwalker enters the battlefield, target creature an opponent controls doesn't untap during its controller's next untap step.

Azorius Chancery

Azorius Chancery enters the battlefield tapped.
When Azorius Chancery enters the battlefield, return a land you control to its owner's hand.
{T}: Add {W}{U}.

Aven Battle Priest

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Aven Battle Priest enters the battlefield, you gain 3 life.

Pondering Mage

When Pondering Mage enters the battlefield, look at the top three cards of your library, then put them back in any order. You may shuffle. Draw a card.

Sage of Epityr

When Sage of Epityr enters the battlefield, look at the top four cards of your library, then put them back in any order.

Pierce Strider

When Pierce Strider enters the battlefield, target opponent loses 3 life.

Omenspeaker

When Omenspeaker enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Deadeye Rig-Hauler

Raid — When Deadeye Rig-Hauler enters the battlefield, if you attacked this turn, you may return target creature to its owner's hand.

Carrier Pigeons

Flying
When Carrier Pigeons enters the battlefield, draw a card at the beginning of the next turn's upkeep.

Rishadan Cutpurse

When Rishadan Cutpurse enters the battlefield, each opponent sacrifices a permanent unless they pay {1}.

Soul's Attendant

Whenever another creature enters the battlefield, you may gain 1 life.

Incubator Drone

Devoid (This card has no color.)
When Incubator Drone enters the battlefield, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add {C}."

Aethersnipe

When Aethersnipe enters the battlefield, return target nonland permanent to its owner's hand.
Evoke {1}{U}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

Seller of Songbirds

When Seller of Songbirds enters the battlefield, create a 1/1 white Bird creature token with flying.

Heliod's Pilgrim

When Heliod's Pilgrim enters the battlefield, you may search your library for an Aura card, reveal it, put it into your hand, then shuffle.

Faerie Mechanist

Flying
When Faerie Mechanist enters the battlefield, look at the top three cards of your library. You may reveal an artifact card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Cave of Temptation

{T}: Add {C}.
{1}, {T}: Add one mana of any color.
{4}, {T}, Sacrifice Cave of Temptation: Put two +1/+1 counters on target creature. Activate only as a sorcery.

Crystal Seer

When Crystal Seer enters the battlefield, look at the top four cards of your library, then put them back in any order.
{4}{U}: Return Crystal Seer to its owner's hand.

Evolving Wilds

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Watertrap Weaver

When Watertrap Weaver enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Aviary Mechanic

When Aviary Mechanic enters the battlefield, you may return another permanent you control to its owner's hand.

Cloudreader Sphinx

Flying
When Cloudreader Sphinx enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Aven of Enduring Hope

Flying
When Aven of Enduring Hope enters the battlefield, you gain 3 life.

Neurok Familiar

Flying
When Neurok Familiar enters the battlefield, reveal the top card of your library. If it's an artifact card, put it into your hand. Otherwise, put it into your graveyard.

Conclave Phalanx

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
When Conclave Phalanx enters the battlefield, you gain 1 life for each creature you control.

Sejiri Steppe

Sejiri Steppe enters the battlefield tapped.
When Sejiri Steppe enters the battlefield, target creature you control gains protection from the color of your choice until end of turn.
{T}: Add {W}.

Mist Raven

Flying
When Mist Raven enters the battlefield, return target creature to its owner's hand.

Cephalid Sage

Threshold — As long as seven or more cards are in your graveyard, Cephalid Sage has "When Cephalid Sage enters the battlefield, draw three cards, then discard two cards."

Wispmare

Flying
When Wispmare enters the battlefield, destroy target enchantment.
Evoke {W} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

Augury Owl

Flying
When Augury Owl enters the battlefield, scry 3. (Look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Drownyard Explorers

When Drownyard Explorers enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Primal Plasma

As Primal Plasma enters the battlefield, it becomes your choice of a 3/3 creature, a 2/2 creature with flying, or a 1/6 creature with defender.

Eddytrail Hawk

Flying
When Eddytrail Hawk enters the battlefield, you get {E}{E} (two energy counters).
Whenever Eddytrail Hawk attacks, you may pay {E}. If you do, another target attacking creature gains flying until end of turn.

Aspiring Aeronaut

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Aspiring Aeronaut enters the battlefield, create a 1/1 colorless Thopter artifact creature token with flying.

Tranquil Cove

Tranquil Cove enters the battlefield tapped.
When Tranquil Cove enters the battlefield, you gain 1 life.
{T}: Add {W} or {U}.

Peregrine Drake

Flying
When Peregrine Drake enters the battlefield, untap up to five lands.

Lotus-Eye Mystics

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Lotus-Eye Mystics enters the battlefield, return target enchantment card from your graveyard to your hand.

Meandering River

Meandering River enters the battlefield tapped.
{T}: Add {W} or {U}.

Bant Panorama

{T}: Add {C}.
{1}, {T}, Sacrifice Bant Panorama: Search your library for a basic Forest, Plains, or Island card, put it onto the battlefield tapped, then shuffle.

Silver Myr

Enlightened Maniac

When Enlightened Maniac enters the battlefield, create a 3/2 colorless Eldrazi Horror creature token.

Azorius Signet

Expedition Raptor

Flying
When Expedition Raptor enters the battlefield, support 2. (Put a +1/+1 counter on each of up to two other target creatures.)

Skystreamer

Assist (Another player can pay up to {4} of this spell's cost.)
Flying
When Skystreamer enters the battlefield, target player gains 4 life.

Auramancer

When Auramancer enters the battlefield, you may return target enchantment card from your graveyard to your hand.