, : 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.)

Krakens, Leviathans, Octopuses, and Serpents you control can't be blocked except by Krakens, Leviathans, Octopuses, and Serpents.

When Serpent Warrior enters, you lose 3 life.

Landfall — Whenever a land you control enters,

Augment (, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

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.)

: Serpentine Kavu gains haste until end of turn.

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

+2: Creatures you control with flying get +1/+1 until end of turn.

−3: Create a 4/4 white Angel creature token with flying and vigilance.

−6: You get an emblem with "If you control a creature, damage that would reduce your life total to less than 1 reduces it to 1 instead."

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

Shambling Vent enters tapped.

: Add or .

: Shambling Vent becomes a 2/3 white and black Elemental creature with lifelink until end of turn. It's still a land.

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Trample

Cumulative upkeep—Put a +1/+1 counter on a creature an opponent controls. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Defender

As long as an artifact entered the battlefield under your control this turn, Shipwreck Sentry can attack as though it didn't have defender.

: Exile Shorecrasher Elemental, then return it to the battlefield face down under its owner's control.

: Shorecrasher Elemental gets +1/-1 or -1/+1 until end of turn.

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever you cast a noncreature spell, you may pay . If you do, target creature gains double strike until end of turn.

Enchant creature

Enchanted creature can't attack or block.

: Exile enchanted creature. Create a Blood token. (It's an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.")

No more than one creature can attack each combat.

No more than one creature can block each combat.

: Destroy target blocking creature at end of combat.

, Pay 1 life: Add or .

, , Sacrifice Silent Clearing: Draw a card.

Return target creature to its owner's hand.

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

Silent Hallcreeper can't be blocked.

Whenever Silent Hallcreeper deals combat damage to a player, choose one that hasn't been chosen —

• Put two +1/+1 counters on Silent Hallcreeper.

• Draw a card.

• Silent Hallcreeper becomes a copy of another target creature you control.

Flying

Whenever Silent Sentinel attacks, you may return target enchantment card from your graveyard to the battlefield.

Flying

Whenever Silent Specter deals combat damage to a player, that player discards two cards.

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

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Silent-Blade Oni deals combat damage to a player, look at that player's hand. You may cast a spell from among those cards without paying its mana cost.

: Add or .

: Silumgar Monument becomes a 4/4 blue and black Dragon artifact creature with flying until end of turn.

Magecraft — Whenever you cast or copy an instant or sorcery spell, target creature gets +1/+0 until end of turn.

Enchant player

At the beginning of your upkeep, put a judgment counter on Sinner's Judgment. Then if there are three or more judgment counters on it, enchanted player loses the game.

If Sinner's Judgment would be put into a graveyard from anywhere, exile it instead.

Flying

Inspired — Whenever Siren of the Silent Song becomes untapped, each opponent discards a card, then each opponent mills a card.

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

Flying, defender

If Skyclave Sentinel was kicked, it enters with two +1/+1 counters on it.

As long as Skyclave Sentinel has a +1/+1 counter on it, it can attack as though it didn't have defender.

When Sleeper Agent enters, target opponent gains control of it.

At the beginning of your upkeep, Sleeper Agent deals 2 damage to you.

Slipstream Serpent can't attack unless defending player controls an Island.

When you control no Islands, sacrifice Slipstream Serpent.

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

Creatures with flying your opponents control get -1/-1.

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

Snubhorn Sentry gets +3/+0 as long as you have the city's blessing.

At the beginning of your upkeep, sacrifice Solitary Confinement unless you discard a card.

Skip your draw step.

You have shroud. (You can't be the target of spells or abilities.)

Prevent all damage that would be dealt to you.

, , Discard a card: You gain 2 life for each card in your hand.

Trample, haste (This creature can deal excess combat damage to the player or planeswalker it's attacking. This creature can attack and as soon as it comes under your control.)

At the beginning of the end step, sacrifice Spark Elemental.

Protection from multicolored (This creature can't be blocked, targeted, dealt damage, enchanted, or equipped by anything multicolored.)

Whenever a nonbasic land an opponent controls enters, you gain 1 life.

Flying

When Sphinx of Enlightenment enters, target opponent draws a card and you draw three cards.

When Spinal Centipede dies, put a +1/+1 counter on target creature you control.

Defender

Metalcraft — As long as you control three or more artifacts, Spire Serpent gets +2/+2 and can attack as though it didn't have defender.

At the beginning of your upkeep, put a spore counter on Sporoloth Ancient.

Creatures you control have "Remove two spore counters from this creature: Create a 1/1 green Saproling creature token."

Flying, vigilance

At the beginning of your end step, if you gained or lost life this turn, target opponent loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card.

Enchant creature

When Stay Hidden, Stay Silent enters, tap enchanted creature.

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

: Shuffle enchanted creature into its owner's library, then manifest dread. Activate only as a sorcery.

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

When Steadfast Sentry dies, put a +1/+1 counter on target creature you control.

(: Add or .)

As Steam Vents enters, you may pay 2 life. If you don't, it enters tapped.

, , Return Steelshaper Apprentice to its owner's hand: Search your library for an Equipment card, reveal that card, put it into your hand, then shuffle.

Reach

When Stickytongue Sentinel enters, return up to one other target permanent you control to its owner's hand.

Discard your hand, then draw two cards. (Then exile this card. You may cast the creature later from exile.)

Whenever one or more cards leave your graveyard, scry 1.

Flying

, Exile the top card of your library: Tap target creature with flying.

, Exile the top card of your library: If the exiled card is a snow land, Storm Elemental gets +1/+1 until end of turn.