mtg.wtf

Flash
Vigilance
When Scuttling Sentinel enters the battlefield, put a +1/+1 counter on another target creature you control. Until end of turn, that creature becomes a blue Crab in addition to its other types and gains hexproof.

Sliver creatures you control have "{2}: Untap this creature."

Trample
Persist

Flying
Whenever Scythe Specter deals combat damage to a player, each opponent discards a card. Each player who discarded a card with the highest mana value among cards discarded this way loses life equal to that mana value.

Living weapon
Equipped creature gets +1/+1.
Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up.
Equip {3}

Whenever a player casts a spell, if it's not their turn, Scytheclaw Raptor deals 4 damage to them.

Flying
When Sea Drake enters the battlefield, return two target lands you control to their owner's hand.

This spell costs {1} less to cast for each creature in your party.

{T}: Draw a card for each Ally you control.

When Sea Gate Oracle enters the battlefield, look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Draw cards equal to the number of cards in your hand plus one. You have no maximum hand size for the rest of the game.

Return up to three target creatures your opponents control to their owners' hands. Scry 1.

Return up to three target creatures and/or enchantments to their owners' hands.

When Sea Hag enters the battlefield, creatures your opponents control get -4/-0 until end of turn.

Sea Monster can't attack unless defending player controls an Island.

Sea Serpent can't attack unless defending player controls an Island.
When you control no Islands, sacrifice Sea Serpent.

{T}: Target land becomes the basic land type of your choice until end of turn.

{U}: Sea Spirit gets +1/+0 until end of turn.

{U}: Regenerate Sea Troll. Activate only if Sea Troll blocked or was blocked by a blue creature this turn.

Mutate {1}{U}
Flash
Whenever this creature deals combat damage to a player, draw a card.

Whenever a Merfolk you control deals combat damage to a player, draw a card.

{4}{U}: Seafloor Stalker gets +1/+0 until end of turn and can't be blocked this turn. This ability costs {1} less to activate for each creature in your party.

{3}, {T}: Search your library for a Merfolk permanent card, put it onto the battlefield, then shuffle.

Ward {3}
When Seal from Existence enters the battlefield, exile target nonland permanent an opponent controls until Seal from Existence leaves the battlefield.

Sacrifice Seal of Doom: Destroy target nonblack creature. It can't be regenerated.