Choose one —

• Return target Aura attached to a creature to its owner's hand.

• Regenerate target green creature.

• Target creature gains trample until end of turn.

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

Whenever Segmented Wurm becomes the target of a spell or ability, put a -1/-1 counter on it.

When Seismic Elemental enters, creatures without flying can't block this turn.

Trample

, Sacrifice a land: Draw a card.

Mountaincycling (, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)

Destroy target land. Up to two target creatures can't block this turn.

Destroy target land. Add .

Seismic Strike deals damage to target creature equal to the number of Mountains you control.

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.)

As long as you control a Plains, Sejiri Merfolk has first strike and lifelink. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Choose one —

• Target creature gets +2/+2 and gains trample until end of turn.

• Exile target creature with power 5 or greater.

• Create a 2/2 white Knight creature token with vigilance.

When Self-Assembler enters, you may search your library for an Assembly-Worker creature card, reveal it, put it into your hand, then shuffle.

, Discard a creature card: Draw a card.

Council's dilemma — Starting with you, each player votes for wild or free. Reveal cards from the top of your library until you reveal a creature card for each wild vote. Put those creature cards onto the battlefield, then shuffle the rest into your library. You may put a permanent card from your hand onto the battlefield for each free vote.

Whenever Semblance Scanner or equipped creature deals combat damage to a player, if it's not a token, conjure a duplicate of it into your hand.

Reconfigure (: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

, : You gain 2 life.

, : Draw a card, then discard a card.

Vigilance

Whenever Sentinel of the Nameless City enters or attacks, create a Map token. (It's an artifact with ", , Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.")

Flash

Enchant creature

Enchanted creature gets +1/+2 and has vigilance.

Addendum — When Sentinel's Mark enters, if you cast it during your main phase, enchanted creature gains lifelink until end of turn.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

When Sepulchral Primordial enters, for each opponent, you may put up to one target creature card from that player's graveyard onto the battlefield under your control.

Whenever Serene Master blocks, exchange its power and the power of target creature it's blocking until end of combat.

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

When Sergeant-at-Arms enters, if it was kicked, create two 1/1 white Soldier creature tokens.

Flying

Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature.

Flying

As Serra's Emissary enters, choose a card type.

You and creatures you control have protection from the chosen card type.

: Add for each enchantment you control.

Flying

When Serum Raker dies, each player discards a card.

Flying

Whenever you cast a noncreature spell, put an oil counter on Serum Sovereign.

, Remove an oil counter from Serum Sovereign: Draw a card, then scry 2.

When Serum Visionary enters, draw a card, then scry 2.

Flying

Whenever you cast a noncreature spell, put an oil counter on Serum-Core Chimera.

Remove three oil counters from Serum-Core Chimera: Draw a card. Then you may discard a nonland card. When you discard a card this way, Serum-Core Chimera deals 3 damage to target creature or planeswalker. Activate only as a sorcery.

When Servo Schematic enters or is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token.

Constellation — Whenever an enchantment you control enters, Setessan Skirmisher gets +1/+1 until end of turn.

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

Return target permanent card with mana value 3 or less from your graveyard to the battlefield. If this spell was cast from a graveyard, you may copy this spell and may choose a new target for the copy.

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

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Scavenge (, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

, : Put target creature you control on top of its owner's library.

, : Shadow Guildmage deals 1 damage to any target and 1 damage to you.

Exile all creature cards from target player's graveyard. You may cast spells from among those cards for as long as they remain exiled, and mana of any type can be spent to cast them.

Flying

When Shadowborn Demon enters, destroy target non-Demon creature.

At the beginning of your upkeep, if there are fewer than six creature cards in your graveyard, sacrifice a creature.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Whenever Shadowmage Infiltrator deals combat damage to a player, you may draw a card.

Flying

Whenever you cycle or discard a card, Shadowstorm Vizier gets +1/+1 until end of turn.

When this creature enters, creatures you control get +1/+1 until end of turn.

: Add two mana in any combination of colors. Spend this mana only to cast creature spells.

Formidable — , : Each player's life total becomes the number of creatures they control. Activate only if creatures you control have total power 8 or greater.

Haste

Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on it.

Ferocious — : Draw a card for each creature you control with power 4 or greater.

Draw a card for each creature you control.

Ferocious — You gain 4 life for each creature you control with power 4 or greater.

Exile target creature card from a graveyard. Create a 2/2 black Zombie creature token. You gain 2 life.

Delve (Each card you exile from your graveyard while casting this spell pays for .)

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Shambling Ghoul enters tapped.

Shambling Remains can't block.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

: Shambling Strider gets +1/-1 until end of turn.

When Shambling Swarm dies, distribute three -1/-1 counters among one, two, or three target creatures. For each -1/-1 counter you put on a creature this way, remove a -1/-1 counter from that creature at the beginning of the next end step.

Commander creatures you own have ": This creature becomes a copy of another target creature."

At the beginning of each opponent's upkeep, that player reveals the top card of their library. If it's a creature card, the player puts the card into their graveyard and Shapeshifter's Marrow becomes a copy of that card. (If it does, it loses this ability.)