This spell costs less to cast if it targets a Dinosaur you control.

Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control. (Each deals damage equal to its power to the other.)

Flying

When Sawtooth Loon enters, return a white or blue creature you control to its owner's hand.

When Sawtooth Loon enters, draw two cards, then put two cards from your hand on the bottom of your library.

Sunburst (This enters with a +1/+1 counter on it for each color of mana spent to cast it.)

Remove two +1/+1 counters from Sawtooth Thresher: Sawtooth Thresher gets +4/+4 until end of turn.

Whenever Scalestorm Summoner attacks, create a 3/1 red Dinosaur creature token if you control a creature with power 4 or greater.

Delirium — This spell costs less to cast if there are four or more card types among cards in your graveyard.

Draw three cards.

Flying

Whenever Screaming Phantom attacks, mill a card. (Put the top card of your library into your graveyard.)

Defender

: Adapt 3. (If this creature has no +1/+1 counters on it, put three +1/+1 counters on it.)

As long as Scuttlegator has a +1/+1 counter on it, it can attack as though it didn't have defender.

Draw cards equal to the number of cards in your hand plus one. You have no maximum hand size for the rest of the game.

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.)

Flash

Whenever this creature deals combat damage to a player, draw a card.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)

Searing Touch deals 1 damage to any target.

Enchant creature or planeswalker you don't control

When Seatower Imprisonment enters the battlefield, conjure a card named Soldiers of the Watch onto the battlefield.

Enchanted permanent can't attack or block, and its activated abilities can't be activated.

Vigilance, haste

Valiant — Whenever Seedglaive Mentor becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it.

, , Discard a card: Target player mills three cards.

Create a red Elemental creature token with trample and "This creature's power and toughness are each equal to the number of instant and sorcery cards in your graveyard plus the number of cards with flashback you own in exile."

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

, Discard a creature card: Draw a card.

Tap up to two target creatures.

Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, those creatures don't untap during their controllers' next untap steps.

: Look at the top three cards of your library, then put them back in any order.

: Draw a card, then put Sensei's Divining Top on top of its owner's library.

Whenever an instant or sorcery spell is cast during your turn, Sentinel Tower deals damage to any target equal to 1 plus the number of instant and sorcery spells cast before that spell this turn.

Trample, haste

Share Intelligence — Whenever Sergeant John Benton deals combat damage to a player, you and that player each draw that many cards.

Whenever Serra Inquisitors blocks or becomes blocked by one or more black creatures, Serra Inquisitors gets +2/+0 until end of turn.

Enchant creature

Enchanted creature gets +2/+2.

Threshold — As long as seven or more cards are in your graveyard, all creatures able to block enchanted creature do so.

When Seven-Tail Mentor enters or dies, put a +1/+1 counter on target creature or Vehicle you control.

Shadowstorm deals 2 damage to each creature with shadow.

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

Whenever one or more +1/+1 counters are put on Sharktocrab, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Kicker (You may pay an additional as you cast this spell.)

Return target creature card from your graveyard to the battlefield. If this spell was kicked, you gain life equal to that card's mana value. Otherwise, you lose that much life.

Exile Sheoldred's Restoration.

This spell can't be countered.

Protection from blue (This creature can't be blocked, targeted, dealt damage, enchanted, or equipped by anything blue.)

: Shifting Ceratops gains your choice of reach, trample, or haste until end of turn.

At the beginning of your upkeep, sacrifice a Snake.

Whenever Shisato, Whispering Hunter deals combat damage to a player, that player skips their next untap step.

First strike, haste

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.)

When Shortcut to Mushrooms enters, the Ring tempts you.

At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a +1/+1 counter on target creature you control.

Until end of turn, creatures you control gain "When this creature dies, it deals 2 damage to target creature an opponent controls."

Survival — At the beginning of your second main phase, if Shrewd Storyteller is tapped, put a +1/+1 counter on target creature.

Deathtouch

Whenever Shroudstomper enters or attacks, each opponent loses 2 life. You gain 2 life and draw a card.

Flash

Squad (As an additional cost to cast this spell, you may pay any number of times. When this creature enters, create that many tokens that are copies of it.)

Benediction of the Omnissiah — When Sicarian Infiltrator enters, draw a card.

Enrage — Whenever Siegehorn Ceratops is dealt damage, put two +1/+1 counters on it. (It must survive the damage to get the counters.)

Flash

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

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

, Remove one or more +1/+1 counters from Simic Manipulator: Gain control of target creature with power less than or equal to the number of +1/+1 counters removed this way.

Return target spell or nonland permanent an opponent controls to its owner's hand.

Sinuous Predator can't be blocked by more than one creature.

Flying

, Sacrifice Siren Stormtamer: Counter target spell or ability that targets you or a creature you control.

As an additional cost to cast this spell, exile three creature cards from your graveyard.

Flying

You may cast Skaab Ruinator from your graveyard.

Each other creature you control that's a Skeleton or Pirate gets +1/+1.

Whenever one or more creature cards leave your graveyard, create a 2/2 black Skeleton Pirate creature token. (This ability triggers only from the battlefield.)

: Return Skeleton Crew from your graveyard to the battlefield tapped.

Skeleton Scavengers enters with a +1/+1 counter on it.

Pay for each +1/+1 counter on Skeleton Scavengers: Regenerate Skeleton Scavengers. When it regenerates this way, put a +1/+1 counter on it.

When you control no Islands, sacrifice Skeleton Ship.

: Put a -1/-1 counter on target creature.

When Skilled Animator enters, target artifact you control becomes an artifact creature with base power and toughness 5/5 for as long as Skilled Animator remains on the battlefield.

: Skittering Heartstopper gains deathtouch until end of turn.

At the beginning of your upkeep, return a black creature you control to its owner's hand.

: Regenerate Skull Collector.

Skybridge Towers enters tapped.

: Add or .

, , Sacrifice Skybridge Towers: 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.")