Thassa’s Rebuff

Counter target spell unless its controller pays , where X is your devotion to blue. (Each in the mana costs of permanents you control counts toward your devotion to blue.)

Forgestoker Dragon

Flying
: Forgestoker Dragon deals 1 damage to target creature. That creature can’t block this combat. Activate this ability only if Forgestoker Dragon is attacking.

Soul of Ravnica

Flying
: Draw a card for each color among permanents you control.
, Exile Soul of Ravnica from your graveyard: Draw a card for each color among permanents you control.

Returned Centaur

When Returned Centaur enters the battlefield, target player mills four cards.

Ordeal of Heliod

Enchant creature
Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice Ordeal of Heliod.
When you sacrifice Ordeal of Heliod, you gain 10 life.

Flamespeaker Adept

Whenever you scry, Flamespeaker Adept gets +2/+0 and gains first strike until end of turn.

Thoughtseize

Target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

Shadowborn Apostle

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 and put it onto the battlefield. Then shuffle your library.

Wild Guess

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

Scourge of Valkas

Flying
Whenever Scourge of Valkas or another Dragon enters the battlefield under your control, it deals X damage to any target, where X is the number of Dragons you control.
: Scourge of Valkas gets +1/+0 until end of turn.

Shadowborn Demon

Flying
When Shadowborn Demon enters the battlefield, destroy target non-Demon creature.
At the beginning of your upkeep, if there are fewer than six creature cards in your graveyard, sacrifice a creature.

Pyrewild Shaman

Bloodrush — , Discard Pyrewild Shaman: Target attacking creature gets +3/+1 until end of turn.
Whenever one or more creatures you control deal combat damage to a player, if Pyrewild Shaman is in your graveyard, you may pay . If you do, return Pyrewild Shaman to your hand.

Corpse Blockade

Defender
Sacrifice another creature: Corpse Blockade gains deathtouch until end of turn.

Wasteland Viper

Deathtouch
Bloodrush — , Discard Wasteland Viper: Target attacking creature gets +1/+2 and gains deathtouch until end of turn.

Treasury Thrull

Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)
Whenever Treasury Thrull attacks, you may return target artifact, creature, or enchantment card from your graveyard to your hand.

Launch Party

As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature. Its controller loses 2 life.

Grave Betrayal

Whenever a creature you don’t control dies, return it to the battlefield under your control with an additional +1/+1 counter on it at the beginning of the next end step. That creature is a black Zombie in addition to its other colors and types.