: Add or .

, , Sacrifice Simic Cluestone: Draw a card.

Simic Growth Chamber enters the battlefield tapped.

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

: Add .

( can be paid with either or .)

: Move a +1/+1 counter from target creature onto another target creature with the same controller.

: Attach target Aura attached to a permanent to another permanent with the same controller.

: Add or .

: Simic Keyrune becomes a 2/3 green and blue Crab artifact creature with hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

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.)

, 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.

, : Add .

Simoon deals 1 damage to each creature target opponent controls.

Each player sacrifices an enchantment.

When Simulacrum Synthesizer enters the battlefield, scry 2.

Whenever another artifact with mana value 3 or greater enters the battlefield under your control, create a 0/0 colorless Construct artifact creature token with "This creature gets +1/+1 for each artifact you control."

Menace

At the beginning of your upkeep, reveal the top card of your library. Any opponent may have you put that card into your graveyard. If a player does, Sin Prodder deals damage to that player equal to that card's mana value. Otherwise, put that card into your hand.

, : Tap target creature.

Corrupted — , : Tap target creature. Activate only if an opponent has three or more poison counters.

Singe deals 1 damage to target creature. That creature becomes black until end of turn.

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.

: Target attacking creature has base power 0 until end of turn.

When Sinister Concierge dies, you may exile it and put three time counters on it. If you do, exile up to one target creature and put three time counters on it. Each card exiled this way that doesn't have suspend gains suspend. (For each card with suspend, its owner removes a time counter from it at the beginning of their upkeep. When the last is removed, they may cast it without paying its mana cost. Those creature spells have haste.)

Enchant creature

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

Counter target spell.

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

Enchant creature

Enchanted creature gets +3/+1 and is black.

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."

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.

When Sinuous Benthisaur enters the battlefield, look at the top X cards of your library, where X is the number of Caves you control plus the number of Cave cards in your graveyard. Put two of those cards into your hand and the rest on the bottom of your library in a random order.

: Sinuous Striker gets +1/-1 until end of turn.

Eternalize—, Discard a card. (, Discard a card, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Naga Warrior with no mana cost. Eternalize only as a sorcery.)

When Siona, Captain of the Pyleas enters the battlefield, look at the top seven cards of your library. You may reveal an Aura card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Whenever an Aura you control becomes attached to a creature you control, create a 1/1 white Human Soldier creature token.

Look at the top two cards of target opponent's library. Exile one of them face down and put the other on the bottom of that library. You may play the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.

Flashback

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

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

When Siren of the Fanged Coast enters the battlefield, if tribute wasn't paid, gain control of target creature.

Raid — This spell costs less to cast if you attacked this turn.

Flying

Flying

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

Exile target creature you control, then return that card to the battlefield under its owner's control. If a Pirate was exiled this way, draw a card.

Sisay, Weatherlight Captain gets +1/+1 for each color among other legendary permanents you control.

: Search your library for a legendary permanent card with mana value less than Sisay's power, put that card onto the battlefield, then shuffle.

: Add .

Flash

Psychic Abomination — When Sister of Silence enters the battlefield, counter target instant spell, sorcery spell, activated ability, or triggered ability.

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 .

+1: Until your next turn, creatures can't attack you or planeswalkers you control unless their controller pays 2 life for each of those creatures.

−3: Search your library for a Dragon card, reveal it, put it into your hand, then shuffle.

−7: Destroy all non-Dragon creatures.

Sivitri, Dragon Master can be your commander.

If an opponent controls a Mountain and you control a Plains, you may cast this spell without paying its mana cost.

Prevent all damage that would be dealt this turn to creatures you control.

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.

As Six-y Beast enters the battlefield, you secretly put six or fewer +1/+1 counters on it, then an opponent guesses the number of counters. If that player guesses right, sacrifice Six-y Beast after it enters the battlefield.

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

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

Trample

Tap three untapped creatures you control: Tap target creature.

Whenever Skanos Dragonheart attacks, it gets +X/+X until end of turn, where X is the greatest power among other Dragons you control and Dragon cards in your graveyard.

Choose a Background (You can have a Background as a second commander.)

: Creatures you control gain trample until end of turn.

: Target land you control becomes a 4/4 Elemental creature until end of turn. It's still a land.

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.

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

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

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

Each creature you control with a +1/+1 counter on it has flying.

Flying

, Sacrifice a creature: Regenerate Skeletal Kathari.