Landfall — Whenever a land you control enters, 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.

Add .

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.

Seismic Shudder deals 1 damage to each creature without flying.

Creatures without flying can't block this turn.

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

Target creature gets +1/+1 and gains first strike until end of turn.

Enchant creature

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

Sejiri Refuge enters tapped.

When Sejiri Refuge enters, you gain 1 life.

: Add or .

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.

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

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.

, , Tap an untapped creature you control: Create a 1/1 green Saproling creature token.

: Create a 1/1 green Saproling creature token.

: Creatures you control get +1/+1 until end of turn.

Reach (This creature can block creatures with flying.)

Selesnya Sagittars can block an additional creature each combat.

: Regenerate Selesnya Sentry.

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

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.

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 — 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.

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

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

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.

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.

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

Golem creatures you control have vigilance.

: Change Sentinel's base toughness to 1 plus the power of target creature blocking or blocked by Sentinel. <I>(This effect lasts indefinitely.)</I>

Vigilance, reach

Defender

At the beginning of combat on your turn, you may clash with an opponent. If you win, Sentry Oak gets +2/+0 and loses defender until end of turn. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their card had a higher mana value.)

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Whenever Septic Rats attacks, if defending player is poisoned, it gets +1/+1 until end of turn.

Flying

Whenever a creature dealt damage by Seraph this turn dies, put that card onto the battlefield under your control at the beginning of the next end step. Sacrifice the creature when you lose control of Seraph.

Flying

Prevent all combat damage that would be dealt to Seraph of the Sword.

Flying

At the beginning of your upkeep, sacrifice a land. If you sacrifice an Island this way, Serendib Djinn deals 3 damage to you.

When you control no lands, sacrifice Serendib Djinn.

: Target creature other than Serendib Sorcerer has base power and toughness 0/2 until end of turn.

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

Shuffle Serene Remembrance and up to three target cards from a single graveyard into their owners' libraries.

At the beginning of your upkeep, destroy all artifacts and enchantments. They can't be regenerated.

, : Create a 1/1 colorless Snake artifact creature token. It has "Whenever this creature deals damage to a player, that player gets a poison counter." (A player with ten or more poison counters loses the game.)

Flash

Enchant creature

Enchanted creature gets +1/+1.

: Regenerate enchanted creature.

Whenever Serpentine Basilisk deals combat damage to a creature, destroy that creature at end of combat.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Target creature gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Flying

Vigilance (Attacking doesn't cause this creature to tap.)

Serra Avatar's power and toughness are each equal to your life total.

When Serra Avatar is put into a graveyard from anywhere, shuffle it into its owner's library.

Creatures with flying get +1/+1.

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

Flying, vigilance

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

Enchant creature

Enchanted creature gets +2/+2 and has flying and vigilance. (Attacking doesn't cause it to tap.)