Flying

Whenever Sedraxis Specter deals combat damage to a player, that player discards a card.

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.)

Enchant creature

Enchanted creature gets +2/+1 and has first strike.

At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice See Red.

Reveal the top eight cards of your library. You may put a creature card from among them onto the battlefield. Put the rest into your graveyard.

Ferocious — If you control a creature with power 4 or greater, you may put two creature cards onto the battlefield instead of one.

Destroy target artifact or enchantment. If was spent to cast this spell, create two 1/1 green Saproling creature tokens.

: Target creature gets +3/+3 until end of turn. Untap that creature.

When Seedpod Caretaker enters the battlefield, choose one —

• Put a +1/+1 counter on target artifact or creature you control.

• Transform target Incubator token you control.

Target creature gets +1/+1 until end of turn.

Target creature gets +1/+1 until end of turn.

Target creature gets +1/+1 until end of turn.

Search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle.

Enchant creature

Enchanted creature can't be blocked except by artifact creatures and/or white creatures.

: Untap target creature.

: Seeker of Sunlight explores. Activate only as a sorcery. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

When Seekers' Squire enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

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

Landfall — Whenever a land enters the battlefield under your control, you may pay . If you do, 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.)

Target creature gets +3/+0 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.

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.)

Seismic Shudder deals 1 damage to each creature without flying.

At the beginning of each player's upkeep, that player loses 2 life and draws two 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.)

Sejiri Glacier enters the battlefield tapped.

: Add .

Sejiri Refuge enters the battlefield tapped.

When Sejiri Refuge enters the battlefield, you gain 1 life.

: Add or .

Sejiri Steppe enters the battlefield tapped.

When Sejiri Steppe enters the battlefield, target creature you control gains protection from the color of your choice until end of turn.

: Add .

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 of your library.)

Each player chooses a color. Then exile each permanent unless it's colorless or it's only the color its controller chose.

Flying

Pay 2 life: Return Selenia, Dark Angel to its owner's hand.

: Add or .

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

Selesnya Sanctuary enters the battlefield tapped.

When Selesnya Sanctuary enters the battlefield, return a land you control to its owner's hand.

: Add .

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

, Sacrifice Selfless Cathar: Creatures you control get +1/+1 until end of turn.

Exile Selfless Glyphweaver: Creatures you control gain indestructible until end of turn.

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

Flash

When Selfless Squire enters the battlefield, prevent all damage that would be dealt to you this turn.

Whenever damage that would be dealt to you is prevented, put that many +1/+1 counters on Selfless Squire.

, Discard a creature card: Draw a card.

When Sell-Sword Brute dies, it deals 2 damage to you.

Parley — : Each player reveals the top card of their library. For each nonland card revealed this way, add and you gain 1 life. Then each player draws a card.

Parley — Each player reveals the top card of their library. For each nonland card revealed this way, you create a 3/3 green Elephant creature token. Then each player draws a card.

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.)

At the beginning of your upkeep, choose target opponent. This turn, that player can't cast spells or activate abilities and plays with their hand revealed. You may play lands and cast spells from that player's hand this turn.

Flying

When Senate Griffin enters the battlefield, scry 1.

When Sengir Autocrat enters the battlefield, create three 0/1 black Serf creature tokens.

When Sengir Autocrat leaves the battlefield, exile all Serf tokens.

Flying

Whenever one or more other creatures die, put a +1/+1 counter on Sengir Connoisseur. This ability triggers only once each turn.

Flying (This creature can't be blocked except by creatures with flying or reach.)

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

Kinship — At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with Sensation Gorger, you may reveal it. If you do, each player discards their hand, then draws four cards.

When Sensor Splicer enters the battlefield, create a 3/3 colorless Phyrexian Golem artifact creature token.

Golem creatures you control have vigilance.

When Sentinel of Lost Lore enters the battlefield, 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.

Flash

When Sentinel of the Pearl Trident enters the battlefield, you may exile target historic permanent you control. If you do, return that card to the battlefield under its owner's control at the beginning of the next end step. (Artifacts, legendaries, and Sagas are historic.)

Sliver creatures you control have vigilance. (Attacking doesn't cause them to tap.)

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.