Sultai Skullkeeper

When Sultai Skullkeeper enters, mill two cards.

Divination

Sensory Deprivation

Enchant creature
Enchanted creature gets -3/-0.

Paralyzing Grasp

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.

Oona's Grace

Target player draws a card.
Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)

Vodalian Soldiers

Dreadwaters

Target player mills X cards, where X is the number of lands you control.

Scatter Arc

Counter target noncreature spell.
Draw a card.

Coastal Discovery

Draw two cards.
Awaken 4—{5}{U} (If you cast this spell for {5}{U}, also put four +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)

Taigam's Strike

Target creature gets +2/+0 until end of turn and can't be blocked this turn.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Voidwielder

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

Shaper Apprentice

Shaper Apprentice has flying as long as you control another Merfolk.

Cloaked Siren

Flash (You may cast this spell any time you could cast an instant.)
Flying

Lotus Path Djinn

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Mistfolk

{U}: Counter target spell that targets Mistfolk.

Stitcher's Apprentice

{1}{U}, {T}: Create a 2/2 blue Homunculus creature token, then sacrifice a creature.

Silent Departure

Return target creature to its owner's hand.
Flashback {4}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Convolute

Counter target spell unless its controller pays {4}.

Horned Turtle

Shipwreck Looter

Raid — When Shipwreck Looter enters, if you attacked this turn, you may draw a card. If you do, discard a card.

Wetland Sambar

Murmuring Phantasm

Lookout's Dispersal

This spell costs {1} less to cast if you control a Pirate.
Counter target spell unless its controller pays {4}.

Take Inventory

Draw a card, then draw cards equal to the number of cards named Take Inventory in your graveyard.

Shrewd Negotiation

Exchange control of target artifact you control and target artifact or creature you don't control.

Uncomfortable Chill

Creatures your opponents control get -2/-0 until end of turn.
Draw a card.

Dwindle

Enchant creature
Enchanted creature gets -6/-0.
When enchanted creature blocks, destroy it. (The attacking creature remains blocked.)

Floodwaters

Return up to two target creatures to their owners' hands.
Cycling {2} ({2}, Discard this card: Draw a card.)

Leave in the Dust

Return target nonland permanent to its owner's hand.
Draw a card.

Dramatic Reversal

Untap all nonland permanents you control.

Mindstatic

Counter target spell unless its controller pays {6}.

Tower Geist

Flying
When Tower Geist enters, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.

Cloud Manta

Tolarian Scholar

Essence Scatter

Aerie Worshippers

Inspired — Whenever Aerie Worshippers becomes untapped, you may pay {2}{U}. If you do, create a 2/2 blue Bird enchantment creature token with flying.

Singing Bell Strike

Enchant creature
When Singing Bell Strike enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Enchanted creature has "{6}: Untap this creature."

Pirate's Prize

Draw two cards. Create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Befuddle

Target creature gets -4/-0 until end of turn.
Draw a card.

Siren Stormtamer

Flying
{U}, Sacrifice Siren Stormtamer: Counter target spell or ability that targets you or a creature you control.

Failed Inspection

Counter target spell. Draw a card, then discard a card.

Wind-Kin Raiders

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Flying

Reverse Engineer

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Draw three cards.

Syncopate

Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Spontaneous Mutation

Flash
Enchant creature
Enchanted creature gets -X/-0, where X is the number of cards in your graveyard.

Seeker of Insight

{T}: Draw a card, then discard a card. Activate only if you've cast a noncreature spell this turn.

Frost Lynx

When Frost Lynx enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Fogwalker

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

Evanescent Intellect

Enchant creature
Enchanted creature has "{1}{U}, {T}: Target player mills three cards."

Gearseeker Serpent

This spell costs {1} less to cast for each artifact you control.
{5}{U}: Gearseeker Serpent can't be blocked this turn.

Huddle Up

Assist (Another player can pay up to {2} of this spell's cost.)
Two target players each draw a card.

Streambed Aquitects

{T}: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.)
{T}: Target land becomes an Island until end of turn.

Claustrophobia

Enchant creature
When Claustrophobia enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Negate

Spell Rupture

Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.

Taigam's Scheming

Surveil 5. (Look at the top five cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Hubris

Return target creature and all Auras attached to it to their owners' hands.

Arcane Flight

Enchant creature
Enchanted creature gets +1/+1 and has flying.

Nephalia Seakite

Waterwhirl

Return up to two target creatures to their owners' hands.

Chasm Drake

Flying
Whenever Chasm Drake attacks, target creature you control gains flying until end of turn.

Frilled Oculus

{1}{G}: Frilled Oculus gets +2/+2 until end of turn. Activate only once each turn.

Aether Theorist

When Aether Theorist enters, you get {E}{E}{E} (three energy counters).
{T}, Pay {E}: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Fleeting Distraction

Target creature gets -1/-0 until end of turn.
Draw a card.

Expel from Orazca

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
Return target nonland permanent to its owner's hand. If you have the city's blessing, you may put that permanent on top of its owner's library instead.

Vedalken Blademaster

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Ringwarden Owl

Flying (This creature can't be blocked except by creatures with flying or reach.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Aven Wind Mage

Flying
Whenever you cast an instant or sorcery spell, Aven Wind Mage gets +1/+1 until end of turn.

Fugitive Wizard

Armored Cancrix

Tragic Lesson

Draw two cards. Then discard a card unless you return a land you control to its owner's hand.

Mystic of the Hidden Way

Mystic of the Hidden Way can't be blocked.
Morph {2}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Havengul Skaab

Whenever Havengul Skaab attacks, return another creature you control to its owner's hand.

Cancel

Pieces of the Puzzle

Reveal the top five cards of your library. Put up to two instant and/or sorcery cards from among them into your hand and the rest into your graveyard.

Runewing

Spectral Prison

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.
When enchanted creature becomes the target of a spell, sacrifice Spectral Prison.

Laboratory Brute

When Laboratory Brute enters, mill four cards.

Incursion Specialist

Whenever you cast your second spell each turn, Incursion Specialist gets +2/+0 until end of turn and can't be blocked this turn.

Tattered Haunter

Flying
Tattered Haunter can block only creatures with flying.

Minamo Scrollkeeper

Defender
Your maximum hand size is increased by one.

Skilled Animator

When Skilled Animator enters, target artifact you control becomes an artifact creature with base power and toughness 5/5 for as long as Skilled Animator remains on the battlefield.

Nimbus Naiad

Bestow {4}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Flying
Enchanted creature gets +2/+2 and has flying.

Quicksilver Geyser

Return up to two target nonland permanents to their owners' hands.

Watercourser

{U}: Watercourser gets +1/-1 until end of turn.

Omenspeaker

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