Gatecrash

Whenever another red creature enters the battlefield under your control, Foundry Street Denizen gets +1/+0 until end of turn.

Target blocking creature gets +3/+0 and gains first strike until end of turn.

Whenever a creature you control deals combat damage, put a blaze counter on Five-Alarm Fire. Remove five blaze counters from Five-Alarm Fire: It de...

Battalion — Whenever Daring Skyjek and at least two other creatures attack, Daring Skyjek gains flying until end of turn.

Battalion — Whenever Firefist Striker and at least two other creatures attack, target creature can't block this turn.

Ember Beast can't attack or block alone.

Battalion — Whenever Bomber Corps and at least two other creatures attack, Bomber Corps deals 1 damage to any target.

{X}{R}, {T}, Sacrifice Cinder Elemental: It deals X damage to any target.

Wight of Precinct Six gets +1/+1 for each creature card in your opponents' graveyards.

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. (It can attack and {T} this turn.)

{1}, Sacrifice a creature: Target player reveals cards from the top of their library until they reveal a land card, then puts those cards into thei...

Target player loses 1 life, discards a card, then sacrifices a permanent. Cipher (Then you may exile this spell card encoded on a creature you cont...

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Whenever another white creature enters the battlefield under your control, tap target creature an opponent controls.

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

Whenever another black creature enters the battlefield under your control, target creature gains intimidate until end of turn. (It can't be blocked...

Target opponent loses 3 life. Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat dam...

Return target creature card from your graveyard to your hand. Cipher (Then you may exile this spell card encoded on a creature you control. Wheneve...

Target player discards a card. Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat da...

Destroy target creature with power X or less.

Creature tokens get -1/-1.

{U}: Horror of the Dim gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

{B}: Gateway Shade gets +1/+1 until end of turn. Tap an untapped Gate you control: Gateway Shade gets +2/+2 until end of turn.