When you cast a creature spell, sacrifice Skittering Horror.

When you cast a creature spell, sacrifice Skittering Monstrosity.

Flying

When you cast a creature spell, sacrifice Skittering Skirge.

Devoid (This card has no color.)

Skitterskin can't block.

: Regenerate Skitterskin. Activate only if you control another colorless creature.

Flying

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

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)

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

Deathtouch

When Skullwinder enters, return target card from your graveyard to your hand, then choose an opponent. That player returns a card from their graveyard to their hand.

Constellation — Whenever Skybind or another enchantment you control enters, exile target nonenchantment permanent. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Flying

When this creature transforms into Skyclave Invader, look at the top card of your library. If it's a land card, you may put it onto the battlefield. If you don't put the card onto the battlefield, put it into your hand.

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.

Flying

When Skyline Despot enters, you become the monarch.

At the beginning of your upkeep, if you're the monarch, create a 5/5 red Dragon creature token with flying.

Flying

When Skyline Savior enters the battlefield, return a permanent you control to its owner's hand. If it's a non-Angel creature card, it perpetually gets +1/+1, gains flying, and becomes an Angel in addition to its other types.

Skyreaping deals damage to each creature with flying equal to your devotion to green. (Each in the mana costs of permanents you control counts toward your devotion to green.)

Each player draws X cards.

Forecast — , Reveal Skyscribing from your hand: Each player draws a card. (Activate only during your upkeep and only once each turn.)

When Skyshroud Sentinel enters, you may search your library for up to three cards named Skyshroud Sentinel, reveal them, put them into your hand, then shuffle.

Flying

Discard a card: Return Skywing Aven to its owner's hand.

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.")

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.

Whenever Slavering Nulls deals combat damage to a player, if you control a Swamp, you may have that player discard a card.

Just a second (As long as this spell is on the stack, players can't move permanents.)

Slaying Mantis enters by being thrown from a distance of at least three feet.

When Slaying Mantis enters, it fights each creature an opponent controls that it touched as it entered.

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>

Create a 0/0 green Ooze creature token with trample. Put X +1/+1 counters on it, where X is two plus the total number of cards you own in exile and in your graveyard that are Oozes or are named Slime Against Humanity.

A deck can have any number of cards named Slime Against Humanity.

Flash (You may cast this spell any time you could cast an instant.)

Enchant creature

Enchanted creature gets -4/-0.

When Sling-Gang Lieutenant enters, 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.

Exile target creature you own, then return it to the battlefield under your control. The Ring tempts you.

Slivers you control have flying and "Whenever you draw a card, this creature deals 1 damage to any target" and ": Draw a card."

, Sacrifice an artifact: Add an amount of equal to the sacrificed artifact's mana value. Spend this mana only to cast artifact spells or activate abilities of artifacts.

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.

, Discard a Spirit or Arcane card: Slumbering Tora becomes an X/X Cat artifact creature until end of turn, where X is the discarded card's mana value.

Slurrk, All-Ingesting enters 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.)

Destroy target artifact or land. If an artifact is destroyed this way, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

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

Smiting Helix deals 3 damage to any target and you gain 3 life.

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

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

Smoldering Crater enters tapped.

: Add .

Cycling (, Discard this card: Draw a card.)

Defender

Whenever you cast an instant or sorcery spell, put a number of ember counters on Smoldering Egg equal to the amount of mana spent to cast that spell. Then if Smoldering Egg has seven or more ember counters on it, remove them and transform Smoldering Egg.

Smoldering Spires enters tapped.

When Smoldering Spires enters, target creature can't block this turn.

: Add .

At the beginning of your upkeep, target player loses 1 life.

Sacrifice Smoldering Tar: It deals 4 damage to target creature. Activate only as a sorcery.

Devoid (This card has no color.)

Flying

At the beginning of your upkeep, sacrifice a creature.

Whenever you sacrifice a creature, draw a card.

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, 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.

Put a +1/+1 counter on target creature you control. It gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

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

Flash

Enrage — Whenever Snapping Sailback is dealt damage, put a +1/+1 counter on it. (It must survive the damage to get the counter.)

Devoid (This card has no color.)

: Add .

, : Draw a card.

Menace

Whenever another creature you control with power 2 or less enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Menace (This creature can't be blocked except by two or more creatures.)

As long as you control a Goblin or Orc, Snarling Warg gets +1/+0.

, : Target creature with power 2 or less can't be blocked this turn.

When Snooping Newsie enters, mill two cards. (Put the top two cards of your library into your graveyard.)

As long as there are five or more mana values among cards in your graveyard, Snooping Newsie gets +1/+1 and has lifelink.