Players can't gain life.

Damage can't be prevented.

When Sunspine Lynx enters, it deals damage to each player equal to the number of nonbasic lands that player controls.

Flying

Put target creature into its owner's library just beneath the top X cards of that library, where X is the number of doors you can see from your seat.

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control."

Create X 1/1 green Saproling creature tokens.

Flash

When Supply Drop enters, target creature you control gets +2/+2 until end of turn.

, , Sacrifice Supply Drop: Draw a card.

Flying

When Supply-Line Cranes enters, put a +1/+1 counter on target creature.

Flying

Champion an Elemental (When this enters, sacrifice it unless you exile another Elemental you control. When this leaves the battlefield, that card returns to the battlefield.)

Suq'Ata Firewalker can't be the target of red spells or abilities from red sources.

: Suq'Ata Firewalker deals 1 damage to any target.

Tap another untapped Rogue you control: Sure-Footed Infiltrator can't be blocked this turn.

Whenever Sure-Footed Infiltrator deals combat damage to a player, draw a card.

You and permanents you control gain hexproof until end of turn. Prevent all damage that black and/or red sources would deal to creatures you control this turn.

Whenever you augment, enchant, or mutate a creature you control, draw a card.

: Add , , , , or .

, Sacrifice Surgical Skullbomb: Draw a card.

, Sacrifice Surgical Skullbomb: Return target creature to its owner's hand. Draw a card. Activate only as a sorcery.

Ripple 4 (When you cast this spell, you may reveal the top four cards of your library. You may cast spells with the same name as this spell from among those cards without paying their mana costs. Put the rest on the bottom of your library.)

Surging Flame deals 2 damage to any target.

Whenever you discard a creature card, put a +1/+1 counter on Surly Badgersaur.

Whenever you discard a land card, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Whenever you discard a noncreature, nonland card, Surly Badgersaur fights up to one target creature you don't control.

Trample

Other creatures you control have trample.

Whenever another nontoken creature you control enters, put a +1/+1 counter on it. It gains haste until end of turn.

At the beginning of combat on your turn, if creatures you control have total power 8 or greater, target creature you control gains haste until end of turn. (It can attack and no matter when it came under your control.)

Return an instant card at random from your graveyard to your hand.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Whenever Surtland Flinger attacks, you may sacrifice another creature. When you do, Surtland Flinger deals damage equal to the sacrificed creature's power to any target. If the sacrificed creature was a Giant, Surtland Flinger deals twice that much damage instead.

When Surveillance Monitor enters, you may collect evidence 4. (Exile cards with total mana value 4 or greater from your graveyard.)

Whenever you collect evidence, create a 1/1 colorless Thopter artifact creature token with flying.

You gain 2 life. Then if you have more life than an opponent, draw a card.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Aftermath (Cast this spell only from your graveyard. Then exile it.)

Each player shuffles their graveyard into their library.

When Suspension Field enters, you may exile target creature with toughness 3 or greater until Suspension Field leaves the battlefield. (That creature returns under its owner's control.)

Flying

Whenever Sustainer of the Realm blocks, it gets +0/+2 until end of turn.

, : Create a colorless snow artifact token named Icy Manalith with ": Add one mana of any color."

, : Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.

Svyelun of Sea and Sky has indestructible as long as you control at least two other Merfolk.

Whenever Svyelun attacks, draw a card.

Other Merfolk you control have ward . (Whenever another Merfolk you control becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

Svyelunite Temple enters tapped.

: Add .

, Sacrifice Svyelunite Temple: Add .

As an additional cost to cast this spell, tap an untapped creature you control.

Exile target tapped creature. Put a +1/+1 counter on the creature tapped to pay this spell's additional cost.

Flying

If a source would deal damage to Swans of Bryn Argoll, prevent that damage. The source's controller draws cards equal to the damage prevented this way.

Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy.

Flying

Whenever CARDNAME attacks, it gets +1/+0 until end of turn for each Locus you control.

When Swarming Goblins enters, roll a d20.

1–9 | Create a 1/1 red Goblin creature token.

10–19 | Create two of those tokens.

20 | Create three of those tokens.

Equipped creature has reach, ", : Tap target artifact or creature," and ", : Discover 10." (Exile cards from the top of your library until you exile a nonland card with mana value 10 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Equip

Any number of target creatures become the color of your choice until end of turn.

Draw a card.

Target creature you control gains double strike until end of turn. (Then exile this card. You may cast the artifact later from exile.)

Flash

Cascade

Reach

When Sweet-Gum Recluse enters, put three +1/+1 counters on each of any number of target creatures that entered this turn.

Target creature gets +2/+2 until end of turn. You may put a land card from your hand onto the battlefield.

Sweltering Suns deals 3 damage to each creature.

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

Exile target nontoken creature. Return it to the battlefield under its owner's control at the beginning of the next end step.

This land enters tapped.

When this land enters, you gain 1 life.

: Add or .

As Swirl the Mists enters, choose a color word.

All instances of color words in the text of spells and permanents are changed to the chosen color word.

: Target creature you control becomes the color or colors of your choice until end of turn.

Flying, vigilance

Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, this creature can't be blocked this turn."

Equipped creature gets +2/+2 and has protection from white and from black.

Whenever equipped creature deals combat damage to a player, you gain 3 life and you may return up to one target creature card from your graveyard to your hand.

Equip

Equipped creature gets +2/+0 and has vigilance.

Whenever equipped creature dies, return it to its owner's hand.

Equip

Reveal the top three cards of your library. For each of those cards, put that card into your hand unless any opponent pays 3 life. Then exile the rest.

Flying, vigilance

When Sword-Swallowing Seraph enters, you may put a name sticker on a nonland permanent you own.

, : Put a +1/+1 counter on another target creature with a name sticker on it. Activate only as a sorcery.

When Sworn to the Legion enters the battlefield, nontoken creatures you control perpetually gain double team. (When a creature with double team attacks, conjure a duplicate into your hand, then both of them perpetually lose double team.)

Whenever you cast a creature spell, it perpetually gains double team.

Vigilance

As long as you control six or more lands, Sylvan Advocate and land creatures you control get +2/+2.