Menace

Whenever Scurrilous Sentry enters or attacks, it connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)

When Scurry of Gremlins enters, create two 1/1 red Gremlin creature tokens. Then you get an amount of (energy counters) equal to the number of creatures you control.

Pay : Creatures you control get +1/+0 and gain haste until end of turn.

At the beginning of your upkeep, if you control five or more lands, put four +1/+1 counters on Scute Mob.

Defender

: Adapt 3. (If this creature has no +1/+1 counters on it, put three +1/+1 counters on it.)

As long as Scuttlegator has a +1/+1 counter on it, it can attack as though it didn't have defender.

, Discard a card: Create a 0/3 blue Crab creature token.

Delirium — Crabs you control get +1/+1 as long as there are four or more card types among cards in your graveyard.

Sacrifice Scuttling Death: Target creature gets -1/-1 until end of turn.

Soulshift 4 (When this creature dies, you may return target Spirit card with mana value 4 or less from your graveyard to your hand.)

Flash

Vigilance

When Scuttling Sentinel enters, 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. (It can't be the target of spells or abilities your opponents control.)

Trample

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Landfall — Whenever a land you control enters, Scythe Leopard gets +1/+1 until end of turn.

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 (When this Equipment enters, create a 0/0 black Phyrexian Germ creature token, then attach this to it.)

Equipped creature gets +1/+1.

Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up.

Equip

Flying

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

Sea Gate enters tapped.

As Sea Gate enters, choose a color other than blue.

: Add or one mana of the chosen color.

This spell costs less to cast for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

When Sea Gate Oracle enters, 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.

Kicker

When Sea Gate Stormcaller enters, copy the next instant or sorcery spell with mana value 2 or less you cast this turn when you cast it. If Sea Gate Stormcaller was kicked, copy that spell twice instead. You may choose new targets for the copies.

As Sea Gate, Reborn enters, you may pay 3 life. If you don't, it enters tapped.

: Add .

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

One or more target creatures become blue until end of turn.

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

Players reveal each card they draw.

Whenever a player draws a land card, that player gains 3 life.

Whenever a player draws a nonland card, that player loses 3 life.

Whenever chaos ensues, put target permanent on top of its owner's library.

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

When you control no Islands, sacrifice Sea Serpent.

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

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

Flying

Blue legendary creatures you control have "bands with other legendary creatures." (Any legendary creatures can attack in a band as long as at least one has "bands with other legendary creatures." Bands are blocked as a group. If at least two legendary creatures you control, one of which has "bands with other legendary creatures," are blocking or being blocked by the same creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Seafloor Debris enters tapped.

: Add .

, Sacrifice Seafloor Debris: Add one mana of any color.

: Seafloor Stalker gets +1/+0 until end of turn and can't be blocked this turn. This ability costs less to activate for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

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

Ward (Whenever this enchantment becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

When Seal from Existence enters, 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.

Sacrifice Seal of Primordium: Destroy target artifact or enchantment.

Sacrifice Seal of Strength: Target creature gets +3/+3 until end of turn.

Look at the top X cards of target opponent's library. Exile one of those cards and put the rest back on top of that player's library in any order.

At the beginning of each upkeep, you may exile target creature card from your graveyard. If you do, create a token that's a copy of that card, except it's a Spirit in addition to its other types. Exile it at the beginning of the next end step.

Look at the top five cards of your library. You may put any number of them into your hand and the rest into your graveyard. You lose 3 life for each card you put into your hand this way.

Reorder your graveyard at random. An opponent chooses a card at random in your graveyard. If it's a creature card, put it onto the battlefield. Otherwise, exile it.

This spell costs less to cast for each creature you attacked with this turn.

When Search Party Captain enters, draw a card.

Whenever a creature attacks you or a planeswalker you control, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Flying

When Searchlight Companion enters, create a 1/1 colorless Spirit creature token.

Searing Barb deals 2 damage to any target. If it's a creature, it can't block this turn. Incubate 1. (Create an Incubator token with a +1/+1 counter on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

Searing Blaze deals 1 damage to target player or planeswalker and 1 damage to target creature that player or that planeswalker's controller controls.

Landfall — If you had a land enter the battlefield under your control this turn, Searing Blaze deals 3 damage to that player or planeswalker and 3 damage to that creature instead.

Searing Flesh deals 7 damage to target opponent or planeswalker.

Whenever you gain life, you may pay . If you do, Searing Meditation deals 2 damage to any target.

Searing Spear deals 3 damage to any target.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)

Searing Touch deals 1 damage to any target.

: Add .

Whenever Seascape Aerialist or another Ally you control enters, you may have Ally creatures you control gain flying until end of turn.

Seaside Citadel enters tapped.

: Add , , or .

When you control no Islands, sacrifice Seasinger.

You may choose not to untap Seasinger during your untap step.

: Gain control of target creature whose controller controls an Island for as long as you control Seasinger and Seasinger remains tapped.