Sacrifice an Elemental: Seething Pathblazer gets +2/+0 and gains first strike until end of turn.

Whenever one or more creature cards are put into your graveyard from anywhere, venture into the dungeon. This ability triggers only once each turn. (To venture into the dungeon, enter the first room or advance to the next room.)

Create Undead — Whenever you complete a dungeon, return target creature card from your graveyard to the battlefield.

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

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Discard a land card: Seismic Assault deals 2 damage to any target.

, , Discard a card: Destroy target land.

Seismic Rupture deals 2 damage to each creature without flying.

Seismic Shudder deals 1 damage to each creature without flying.

Creatures without flying can't block this turn.

Seismic Wave deals 2 damage to any target and 1 damage to each nonartifact creature target opponent controls.

Untap target creature. After this main phase, there is an additional combat phase followed by an additional main phase.

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

This spell costs less to cast if you've committed a crime this turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)

Draw two cards.

As an additional cost to cast this spell, discard a card.

Draw two cards and create a Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")

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.)

Enchant creature

Whenever enchanted creature becomes tapped, Seizures deals 3 damage to that creature's controller unless that player pays .

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.)

Target creature you control gains protection from the color of your choice until end of turn.

Sekki, Seasons' Guide enters with eight +1/+1 counters on it.

If damage would be dealt to Sekki, prevent that damage, remove that many +1/+1 counters from Sekki, and create that many 1/1 colorless Spirit creature tokens.

Sacrifice eight Spirits: Return Sekki from your graveyard to the battlefield.

Return target tapped creature to its owner's hand. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Search your library for any number of nonland cards, exile them, then shuffle.

Return X target creatures of the creature type of your choice to their owner's hand.

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.

: Exile target creature card from a graveyard, then populate. (Create a token that's a copy of a creature token you control.)

This land enters tapped.

: Add or .

: Add or .

: Selesnya Keyrune becomes a 3/3 green and white Wolf artifact creature until end of turn.

Reach (This creature can block creatures with flying.)

Selesnya Sagittars can block an additional creature each combat.

: Regenerate Selesnya Sentry.

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

Target opponent sacrifices a green or white creature of their choice. If that player does, they lose 2 life.

: Exile target creature card from a graveyard. That card deals damage equal to its power to Selfless Exorcist.

Whenever a Samurai or Warrior you control attacks alone, it gains lifelink until end of turn.

Sacrifice Selfless Samurai: Another target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Flying

Sacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.

Create a token that's a copy of target creature you control.

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

Whenever Selhoff Occultist or another creature dies, target player mills a card.

When Seller of Songbirds enters, create a 1/1 white Bird creature token with flying.

Vigilance

Whenever you cast a creature spell, create a 1/1 red Mercenary creature token with ": Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."

: Choose a color. Add one mana of that color for each different power among creatures you control.

Whenever another creature enters, its controller may draw a card if its power is greater than each other creature's power.

, : Add X mana in any combination of colors, where X is the greatest power among creatures you control.

Parley — When Selvala's Enforcer enters, each player reveals the top card of their library. For each nonland card revealed this way, put a +1/+1 counter on Selvala's Enforcer. Then each player draws a card.

Imprint — When Semblance Anvil enters, you may exile a nonland card from your hand.

Spells you cast that share a card type with the exiled card cost less to cast.

Exile any number of target creatures and/or planeswalkers you control. At the beginning of the next end step, return each of them to the battlefield under its owner's control. Each of them enters with an additional +1/+1 counter on it if it's a creature and an additional loyalty counter on it if it's a planeswalker.

Flying

: Senate Courier gains vigilance until end of turn.

, : You gain 2 life.

, : Draw a card, then discard 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.

Flying

Whenever a creature dealt damage by Sengir Bats this turn dies, put a +1/+1 counter on Sengir Bats.

Flying

, Exile Sengir Nosferatu: Create a 1/2 black Bat creature token with flying. It has ", Sacrifice this creature: Return an exiled card named Sengir Nosferatu to the battlefield under its owner's control."

Flying

Whenever another creature dies, put two +1/+1 counters on Sengir, the Dark Baron.

Whenever another player loses the game, you gain life equal to that player's life total as the turn began.

Partner (You can have two commanders if both have partner.)

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

, : Put a training counter on target creature. That creature gains bushido 1 and becomes a Samurai in addition to its other creature types. Activate only as a sorcery.

Enchant creature

Enchanted creature gets +2/+2.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Enchant creature

Enchanted creature gets -3/-0.

When Sentinel of Lost Lore enters, choose one or more —

• Return target card you own in exile that has an Adventure to your hand.

• Put target card you don't own in exile that has an Adventure on the bottom of its owner's library.

• Exile target player's graveyard.