Whenever Silkenfist Fighter becomes blocked, untap it.

Flying, hexproof

Whenever a Dragon you control attacks, creatures defending player controls get -1/-1 until end of turn.

Flying (This creature can't be blocked except by creatures with flying or reach.)

, Sacrifice Silverchase Fox: Exile target enchantment.

Flying, first strike

Trample

Whenever a Wolf or Werewolf you control becomes the target of an instant or sorcery spell, create a 2/2 green Wolf creature token.

Whenever Silverpelt Werewolf deals combat damage to a player, draw a card.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Silverpelt Werewolf.

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

, : Move a +1/+1 counter from Simic Fluxmage onto target creature.

Flash

When Singer of Swift Rivers enters the battlefield, put a shield counter on another target creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

You may cast Merfolk spells as though they had flash.

: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Until end of turn, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead. Exile Sins of the Past.

Destroy target creature. Its controller loses 2 life.

At the beginning of each end step, each player discards their hand.

Flying

Whenever you cast a Spirit or Arcane spell, you may draw a card.

Flying

Inspired — Whenever Siren of the Silent Song becomes untapped, each opponent discards a card, then each opponent mills a card.

Sisterhood of Karn enters the battlefield with a +1/+1 counter on it.

Paradox — Whenever you cast a spell from anywhere other than your hand, double the number of +1/+1 counters on Sisterhood of Karn.

: Add .

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)

Flying

: Return Skarrgan Firebird from your graveyard to your hand. Activate only if an opponent was dealt damage this turn.

Skemfar Elderhall enters the battlefield tapped.

: Add .

, , Sacrifice Skemfar Elderhall: Up to one target creature you don't control gets -2/-2 until end of turn. Create two 1/1 green Elf Warrior creature tokens. Activate only as a sorcery.

Target creature gets +2/+0 and gains first strike until end of turn.

Flying

Discard a card: Add .

, , Sacrifice a Human: Destroy target creature.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

Skrelv, Defector Mite can't block.

, : Choose a color. Another target creature you control gains toxic 1 and hexproof from that color until end of turn. It can't be blocked by creatures of that color this turn. ( can be paid with either or 2 life.)

Target player discards a card.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

: Add .

Sacrifice Skull of Ramos: Add .

Flying

Flying

Whenever you cast a Spirit or Arcane spell, you may gain control of target creature with that spell's mana value until end of turn.

Reach

When Skyfisher Spider enters the battlefield, you may sacrifice another creature. When you do, destroy target nonland permanent.

When Skyfisher Spider dies, you may gain 1 life for each creature card in your graveyard. If you do, exile Skyfisher Spider from your graveyard.

Flying

Converge — Skyrider Elf enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.

: Add .

: Add or .

Skyshroud Forest enters the battlefield tapped.

: Add .

: Add or . Skyshroud Forest deals 1 damage to you.

Flying

Whenever Skystrike Officer attacks, create a 1/1 colorless Soldier artifact creature token.

Tap three untapped Soldiers you control: Draw a card.

Whenever Slagstone Refinery or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

, , Discard your hand: Draw a card for each creature you control.

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.

Tap target creature. It doesn't untap during its controller's next untap step.

Escape—, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

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.

Change the text of target spell or permanent by replacing all instances of one color word with another. <I>(For example, you may change "target black spell" to "target blue spell." This effect lasts indefinitely.)</I>

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.

Domain — Search your library for up to two land cards that each have a basic land type, put them onto the battlefield tapped, then shuffle. Look at the top X cards of your library, where X is the number of basic land types among lands you control. Put up to one of them on top of your library and the rest on the bottom of your library in a random order.

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

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Target creature you control fights up to one target creature you don't control.

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

Tribute 3 (As this creature enters the battlefield, an opponent of your choice may put three +1/+1 counters on it.)

When Snake of the Golden Grove enters the battlefield, if tribute wasn't paid, you gain 4 life.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Double strike

Whenever this creature mutates, it deals 4 damage to target creature or planeswalker an opponent controls and you gain 4 life.

Defender (This creature can't attack.)

: Snow Fortress gets +1/+0 until end of turn.

: Snow Fortress gets +0/+1 until end of turn.

: Snow Fortress deals 1 damage to target creature without flying that's attacking you.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Whenever an Island is tapped for mana, its controller may add an additional . If that Island is snow, its controller may add an additional instead. Spend this mana only to pay cumulative upkeep costs.