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, 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 Selkie Hedge-Mage enters, if you control two or more Forests, you may gain 3 life.

When Selkie Hedge-Mage enters, if you control two or more Islands, you may return target tapped creature to its owner's hand.

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.

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.

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.

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.

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.")

Haste

As long as an artifact entered the battlefield under your control this turn, creatures you control get +2/+2.

Battalion — Whenever Sentinel Sarah Lyons and at least two other creatures attack, Sentinel Sarah Lyons deals damage equal to the number of artifacts you control to target player.

Vigilance, reach

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.

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.

Flying, vigilance

, Pay 3 life: Regenerate Sentry of the Underworld.

Sacrifice another creature: Sepulcher Ghoul gets +2/+2 until end of turn. Activate only once each turn.

Flying

: Seraph of the Scales gains vigilance until end of turn.

: Seraph of the Scales gains deathtouch until end of turn.

Afterlife 2 (When this creature dies, create two 1/1 white and black Spirit creature tokens with flying.)

Serpent of the Endless Sea's power and toughness are each equal to the number of Islands you control.

Serpent of the Endless Sea can't attack unless defending player controls an Island.

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.)

Flying

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

: Prevent the next 1 damage that would be dealt to any target this turn.

, : Target creature gains vigilance until end of turn.

First strike

At the beginning of your upkeep, you may put a verse counter on Serra's Liturgy.

, Sacrifice Serra's Liturgy: Destroy up to X target artifacts and/or enchantments, where X is the number of verse counters on Serra's Liturgy.

Servant of the Scale enters with a +1/+1 counter on it.

When Servant of the Scale dies, put X +1/+1 counters on target creature you control, where X is the number of +1/+1 counters on Servant of the Scale.

Vigilance, haste

Whenever Sethron, Hurloon General or another nontoken Minotaur you control enters, create a 2/3 red Minotaur creature token.

: Minotaurs you control get +1/+0 and gain menace and haste until end of turn. ( can be paid with either or .)

Exile target creature. Put two loyalty counters on a planeswalker you control.

Exile all attacking creatures target player controls. That player may search their library for that many basic land cards, put those cards onto the battlefield tapped, then shuffle.

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

Exile target creature and all other creatures with the same name as that creature.

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

Prevent all damage that would be dealt to Sevinne, the Chronoclasm.

Whenever you cast your first instant or sorcery spell from your graveyard each turn, copy that spell. You may choose new targets for the copy.

: Sewer Crocodile can't be blocked this turn. This ability costs less to activate if there are five or more mana values among cards in your graveyard.

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.)

Whenever you cast your second spell each turn, choose target creature an opponent controls. If it's tapped, put a stun counter on it. Otherwise, tap it. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Enchant creature

Enchanted creature doesn't untap during its controller's untap step.

: Return Shackles to its owner's hand.

Flying

Whenever another creature you control with flying dies, put a +1/+1 counter on target creature you control.

Flying

Enchant creature

Enchanted creature has first strike.

: Enchanted creature gets +2/+2 until end of turn.

Target opponent loses 3 life.

Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

, , Sacrifice Shadowblood Egg: Add . Draw a card.

A deck can have any number of cards named Shadowborn Apostle.

, Sacrifice six creatures named Shadowborn Apostle: Search your library for a Demon creature card, put it onto the battlefield, then shuffle.

Whenever a creature you control explores, put a +1/+1 counter on Shadowed Caravel.

Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)

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, double strike

At the beginning of combat on your turn, you may choose two. Each mode must target a different player.

• Target player creates a 2/1 white and black Inkling creature token with flying.

• Target player draws a card and loses 1 life.

• Target player puts a +1/+1 counter on each creature they control.

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