Whenever Silkenfist Fighter becomes blocked, untap it.

Flying

, Sacrifice Silkwing Scout: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Exploit (When this creature enters, you may sacrifice a creature.)

When Silumgar Butcher exploits a creature, target creature gets -3/-3 until end of turn.

Conjure Elemental — : Untap target land you control. It becomes an 8/8 Elemental creature with trample and haste until end of turn. It's still a land.

When Silver Deputy enters, you may search your library for a basic land card or a Desert card, reveal it, then shuffle and put it on top.

: Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery.

: Add .

Trample

When Silverback Shaman dies, draw a card.

Silverbluff Bridge enters tapped.

Indestructible

: Add or .

Flying, first strike

Put a +1/+1 counter on each creature you control.

Adamant — If at least three white mana was spent to cast this spell, creatures you control gain vigilance until end of turn.

: Target creature gets -X/-0 until end of turn, where X is the number of Merfolk and/or Faeries you control.

Silverquill Campus enters tapped.

: Add or .

, : Scry 1.

Flash

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

Flash

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Exile Simian Spirit Guide from your hand: Add .

Simic Growth Chamber enters tapped.

When Simic Growth Chamber enters, return a land you control to its owner's hand.

: Add .

Graft 1 (This creature enters with a +1/+1 counter on it. Whenever another creature enters, you may move a +1/+1 counter from this creature onto it.)

: Untap Simic Ragworm.

Each player sacrifices an enchantment.

All Sliver creatures get +1/+1.

When Singe-Mind Ogre enters, target player reveals a card at random from their hand, then loses life equal to that card's mana value.

Enchant creature

Whenever enchanted creature attacks or blocks, its controller loses 2 life.

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

Sweep — Return any number of Swamps you control to their owner's hand. Target player discards a card for each Swamp returned this way.

Enchant creature

Enchanted creature doesn't untap during its controller's untap step.

Enchanted creature has ", Put a -1/-1 counter on this creature: Untap this creature."

Destroy target creature. Its controller loses 2 life.

Flying

When Siren Lookout enters, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Enchant creature

When Sisay's Ingenuity enters, draw a card.

Enchanted creature has ": Target creature becomes the color of your choice until end of turn."

: Add .

Choose target creature. Roll a six-sided die.

1 — It has base toughness 1 until end of turn.

2 — Put two -1/-1 counters on it.

3 — Six-Sided Die deals 3 damage to it and you gain 3 life.

4 — It gets -4/-4 until end of turn.

5 — Destroy it.

6 — Exile it.

Sizzling Barrage deals 4 damage to target creature that blocked this turn.

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters with a +1/+1 counter on it.)

Creatures with power less than Skarrgan Pit-Skulk's power can't block it.

Flying

, Sacrifice a creature: Regenerate Skeletal Kathari.

When Skeleton Archer enters, it deals 1 damage to any target.

Reach

Whenever Skewer Slinger blocks or becomes blocked by a creature, Skewer Slinger deals 1 damage to that creature.

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

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

When Skinthinner is turned face up, destroy target nonblack creature. It can't be regenerated.

Flying

Discard a card: Add .

Whenever Skirk Drill Sergeant or another Goblin dies, you may pay . If you do, reveal the top card of your library. If it's a Goblin permanent card, put it onto the battlefield. Otherwise, put it into your graveyard.

As long as you control a Beast, Skirk Outrider gets +2/+2 and has trample.

Skirk Shaman can't be blocked except by artifact creatures and/or red creatures.

: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.)

: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)

As long as Skittering Crustacean is monstrous, it has hexproof. (It can't be the target of spells or abilities your opponents control.)

When you cast a creature spell, sacrifice Skittering Horror.

When Skittering Surveyor enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Whenever a land card is put into your graveyard from anywhere, you gain 1 life.

: Mill a card. (Put the top card of your library into your graveyard.)

, Sacrifice another creature or an enchantment: Skophos Warleader gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures.)

Until end of turn, target creature you control gets +1/+1 and target creature an opponent controls gets -1/-1.

Flying

When Skulking Ghost becomes the target of a spell or ability, sacrifice it.