Whenever Slate Street Ruffian becomes blocked, defending player discards a card.

Toxic 2 (Players dealt combat damage by this creature also get two poison counters.)

Whenever another creature you control with toxic attacks, it gets +1/+1 until end of turn.

Bloodrush — , Discard Slaughterhorn: Target attacking creature gets +3/+2 until end of turn.

Whenever you sacrifice a permanent, Slaughter-Priest of Mogis gets +2/+0 until end of turn.

, Sacrifice another creature or an enchantment: Slaughter-Priest of Mogis gains first strike until end of turn.

When Slayer of the Wicked enters the battlefield, you may destroy target Vampire, Werewolf, or Zombie.

Flying, ward

Sleep-Cursed Faerie enters the battlefield tapped with three stun counters on it. (If it would become untapped, remove a stun counter from it instead.)

: Untap Sleep-Cursed Faerie.

More Than Meets the Eye (You may cast this card converted for .)

Double strike, haste

At the beginning of each opponent's upkeep, you may have that player gain control of Slicer until end of turn. If you do, untap Slicer, goad it, and it can't be sacrificed this turn. If you don't, convert it.

Flying, haste

Whenever you cast a noncreature spell, Slickshot Show-Off gets +2/+0 until end of turn.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

Whenever Slimefoot and Squee enters the battlefield or attacks, create a 1/1 green Saproling creature token.

, Sacrifice a Saproling: Return Slimefoot and Squee and up to one other target creature card from your graveyard to the battlefield. Activate only as a sorcery.

At the beginning of combat on your turn, target creature you control with power 2 or less gets +1/+0 and gains deathtouch until end of turn.

When Sling-Gang Lieutenant enters the battlefield, create two 1/1 red Goblin creature tokens.

Sacrifice a Goblin: Target player loses 1 life and you gain 1 life.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Whenever Slinking Giant blocks or becomes blocked, it gets -3/-0 until end of turn.

Flying

, Sacrifice Slinking Skirge: Draw a card.

Flash

Hexproof

When Slippery Bogbonder enters the battlefield, put a hexproof counter on target creature. Then move any number of counters from among creatures you control onto that creature.

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

As long as you have the city's blessing, Slippery Scoundrel has hexproof and can't be blocked.

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

When you control no Islands, sacrifice Slipstream Serpent.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Flying

Whenever Slith Ascendant deals combat damage to a player, put a +1/+1 counter on it.

Haste

Whenever Slith Firewalker deals combat damage to a player, put a +1/+1 counter on it.

Whenever Slith Strider becomes blocked, draw a card.

Whenever Slith Strider deals combat damage to a player, put a +1/+1 counter on it.

Scavenge (, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

When Slithermuse leaves the battlefield, choose an opponent. If that player has more cards in hand than you, draw cards equal to the difference.

Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

When Slithery Stalker enters the battlefield, exile target green or white creature an opponent controls.

When Slithery Stalker leaves the battlefield, return the exiled card to the battlefield under its owner's control.

Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.)

: Search your library for a Sliver card, reveal that card, put it into your hand, then shuffle.

: Gain control of target Sliver. (This effect lasts indefinitely.)

, , Discard a card: Create a 1/1 colorless Sliver artifact creature token named Metallic Sliver.

Sacrifice an artifact: Target artifact gains indestructible until end of turn.

Trample

Whenever a land card is put into your graveyard from anywhere, put a +1/+1 counter on Slogurk, the Overslime.

Remove three +1/+1 counters from Slogurk: Return it to its owner's hand.

When Slogurk leaves the battlefield, return up to three target land cards from your graveyard to your hand.

Devoid (This card has no color.)

Ingest (Whenever this creature deals combat damage to a player, that player exiles the top card of their library.)

: Sludge Crawler gets +1/+1 until end of turn.

Whenever another artifact you control enters or leaves the battlefield, you may pay . If you do, target player loses 1 life and you gain 1 life.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Scavenge (, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Flying

Slumbering Dragon can't attack or block unless it has five or more +1/+1 counters on it.

Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on Slumbering Dragon.

Slurrk, All-Ingesting enters the battlefield with five +1/+1 counters on it.

Whenever Slurrk or another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on each creature you control that has a +1/+1 counter on it.

Partner (You can have two commanders if both have partner.)

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

Whenever a nontoken artifact you control is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token.

Whenever Sly Spy deals combat damage to a player, you may destroy target creature facing left in its art. (Creatures without faces don't face anywhere.)

Whenever Sly Spy deals combat damage to a player, you may destroy target creature facing right in its art. (Creatures without faces don't face anywhere.)

Whenever Sly Spy deals combat damage to a player, roll a six-sided die. That player loses life equal to the result.

At the beginning of your end step, if a creature died under your control this turn, the Ring tempts you.

Whenever the Ring tempts you, target opponent reveals cards from the top of their library until they reveal a land card. Put that card onto the battlefield tapped under your control and the rest into their graveyard.

When Smelt-Ward Gatekeepers enters the battlefield, if you control two or more Gates, gain control of target creature an opponent controls until end of turn. Untap that creature. It gains haste until end of turn.

Whenever you cast an instant or sorcery spell, target creature an opponent controls can't block this turn.

Lifelink

Whenever Smogsteed Rider attacks, each other attacking creature gains fear until end of turn. (They can't be blocked except by artifact creatures and/or black creatures.)

: Add two mana in any combination of colors. Spend this mana only to cast Elemental spells or activate abilities of Elementals.

Whenever a player casts a black spell, you may pay . If you do, target player loses 1 life.

When Smoldering Efreet dies, it deals 2 damage to you.

When Smoldering Werewolf enters the battlefield, it deals 1 damage to each of up to two target creatures.

: Transform Smoldering Werewolf.

Draft Smuggler Captain face up.

As you draft a card, you may reveal it, note its name, then turn Smuggler Captain face down.

When Smuggler Captain enters the battlefield, you may search your library for a card with a name you noted for cards named Smuggler Captain, reveal it, put it into your hand, then shuffle.

Flash

When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

Landfall — Whenever a land enters the battlefield under your control, Snapping Creeper gains vigilance until end of turn.

Landfall — Whenever a land enters the battlefield under your control, Snapping Gnarlid gets +1/+1 until end of turn.