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Whenever you gain life, put a +1/+1 counter on Ajani's Pridemate.

{T}: Prodigal Sorcerer deals 1 damage to any target.

When Banishing Light enters the battlefield, exile target nonland permanent an opponent controls until Banishing Light leaves the battlefield.

When Ovinomancer enters the battlefield, sacrifice it unless you return three basic lands you control to their owner's hand. {T}, Return Ovinomanc...

Mistform Ultimus is every creature type (even if this card isn't on the battlefield).

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

You may choose not to untap Giant Oyster during your untap step. {T}: For as long as Giant Oyster remains tapped, target tapped creature doesn't u...

Trample Leviathan enters the battlefield tapped and doesn't untap during your untap step. At the beginning of your upkeep, you may sacrifice two ...

Flying {U}{U}{U}: Regenerate Ghost Ship.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) {1}{W}{W}: Target Knight ...

Protection from red Shadow (This creature can block or be blocked by only creatures with shadow.)

{2}, Discard a card at random: Stormbind deals 2 damage to any target.

Whenever a Sliver becomes blocked, that Sliver gets +1/+1 until end of turn for each creature blocking it.

Return target creature card from your graveyard to the battlefield.

{3}: Target creature gains islandwalk until end of turn. When War Barge leaves the battlefield this turn, destroy that creature. A creature destroy...

Gemstone Mine enters the battlefield with three mining counters on it. {T}, Remove a mining counter from Gemstone Mine: Add one mana of any color. ...

{T}: Add {C}. {T}: Desert deals 1 damage to target attacking creature. Activate only during the end of combat step.

{3}, {T}: Tap target creature you control and target creature of an opponent's choice they control. Those creatures fight each other. (Each deals d...

Choose a number. Destroy all artifacts and creatures with mana value equal to that number. Then target player reveals their hand and discards all n...

{T}: Until end of turn, target creature has base power 1 or base toughness 1.

As Teferi's Moat enters the battlefield, choose a color. Creatures of the chosen color without flying can't attack you.

{T}: Add {C}.

({T}: Add {U}.) Mystic Sanctuary enters the battlefield tapped unless you control three or more other Islands. When Mystic Sanctuary enters the bat...

Bojuka Bog enters the battlefield tapped. When Bojuka Bog enters the battlefield, exile target player's graveyard. {T}: Add {B}.