Angel of Mercy

Flying
When Angel of Mercy enters the battlefield, you gain 3 life.

Mist Raven

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

Arashin Cleric

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

Goliath Paladin

Vigilance
When Goliath Paladin enters the battlefield, you take the initiative.

Elrond, Lord of Rivendell

Whenever Elrond, Lord of Rivendell or another creature enters the battlefield under your control, scry 1. If this is the second time this ability has resolved this turn, the Ring tempts you.

Aven Surveyor

Flying
When Aven Surveyor enters the battlefield, choose one —
• Put a +1/+1 counter on Aven Surveyor.
• Return target creature to its owner's hand.

Angelic Quartermaster

Flying
When Angelic Quartermaster enters the battlefield, put a +1/+1 counter on each of up to two other target creatures.

Amphin Mutineer

When Amphin Mutineer enters the battlefield, exile up to one target non-Salamander creature. That creature's controller creates a 4/3 blue Salamander Warrior creature token.
Encore {4}{U}{U} ({4}{U}{U}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Palace Jailer

When Palace Jailer enters the battlefield, you become the monarch.
When Palace Jailer enters the battlefield, exile target creature an opponent controls until an opponent becomes the monarch.

Mulldrifter

Flying
When Mulldrifter enters the battlefield, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

Astral Dragon

Flying
Project Image — When Astral Dragon enters the battlefield, create two tokens that are copies of target noncreature permanent, except they're 3/3 Dragon creatures in addition to their other types, and they have flying.

Brightmare

When Brightmare enters the battlefield, tap up to one target creature. You gain life equal to that creature's power.

Ajani's Welcome

Whenever a creature enters the battlefield under your control, you gain 1 life.

Faramir, Steward of Gondor

Whenever a legendary creature with mana value 4 or greater enters the battlefield under your control, you become the monarch.
At the beginning of your end step, if you're the monarch, create two 1/1 white Human Soldier creature tokens.

Air-Cult Elemental

Flying
Whirlwind — When Air-Cult Elemental enters the battlefield, return up to one other target creature to its owner's hand.

Ancestor's Chosen

First strike (This creature deals combat damage before creatures without first strike.)
When Ancestor's Chosen enters the battlefield, you gain 1 life for each card in your graveyard.

Inspiring Captain

When Inspiring Captain enters the battlefield, creatures you control get +1/+1 until end of turn.

Island

Ironpaw Aspirant

When Ironpaw Aspirant enters the battlefield, put a +1/+1 counter on target creature.

Irregular Cohort

Changeling (This card is every creature type.)
When Irregular Cohort enters the battlefield, create a 2/2 colorless Shapeshifter creature token with changeling.

Keensight Mentor

When Keensight Mentor enters the battlefield, put a vigilance counter on target non-Human creature you control.
{1}{W}, {T}: Put a +1/+1 counter on each creature you control with vigilance.

Scourge of Fleets

When Scourge of Fleets enters the battlefield, return each creature your opponents control with toughness X or less to its owner's hand, where X is the number of Islands you control.

Plains

Cloudblazer

Flying
When Cloudblazer enters the battlefield, you gain 2 life and draw two cards.

Enlightened Maniac

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

Distinguished Conjurer

Whenever another creature enters the battlefield under your control, you gain 1 life.
{4}{W}, {T}: Exile another target creature you control, then return it to the battlefield under its owner's control.

Anafenza, Kin-Tree Spirit

Whenever another nontoken creature enters the battlefield under your control, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

Abuelo, Ancestral Echo

Flying, ward {2}
{1}{W}{U}: Exile another target creature or artifact you control. Return it to the battlefield under its owner's control at the beginning of the next end step.

Eternal Skylord

When Eternal Skylord enters the battlefield, amass Zombies 2. (Put two +1/+1 counters 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.)
Zombie tokens you control have flying.

Aarakocra Sneak

Flying
When Aarakocra Sneak enters the battlefield, you take the initiative.

Kutzil's Flanker

Flash
When Kutzil's Flanker enters the battlefield, choose one —
• Put a +1/+1 counter on Kutzil's Flanker for each creature that left the battlefield under your control this turn.
• You gain 2 life and scry 2.
• Exile target player's graveyard.

Angler Drake

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