Spread the Sickness

Destroy target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Combust

This spell can’t be countered.
Combust deals 5 damage to target white or blue creature. The damage can’t be prevented.

Dragonlord Kolaghan

Flying, haste
Other creatures you control have haste.
Whenever an opponent casts a creature or planeswalker spell with the same name as a card in their graveyard, that player loses 10 life.

Dragonlord Kolaghan

Flying, haste
Other creatures you control have haste.
Whenever an opponent casts a creature or planeswalker spell with the same name as a card in their graveyard, that player loses 10 life.

Kolaghan, the Storm’s Fury

Flying
Whenever a Dragon you control attacks, creatures you control get +1/+0 until end of turn.
Dash (You may cast this spell for its dash cost. If you do, it gains haste, and it’s returned from the battlefield to its owner’s hand at the beginning of the next end step.)

Kolaghan, the Storm’s Fury

Flying
Whenever a Dragon you control attacks, creatures you control get +1/+0 until end of turn.
Dash (You may cast this spell for its dash cost. If you do, it gains haste, and it’s returned from the battlefield to its owner’s hand at the beginning of the next end step.)

Temur Battle Rage

Target creature gains double strike until end of turn. (It deals both first-strike and regular combat damage.)
Ferocious — That creature also gains trample until end of turn if you control a creature with power 4 or greater.

Jeskai Runemark

Enchant creature
Enchanted creature gets +2/+2.
Enchanted creature has flying as long as you control a red or white permanent.

Griselbrand

Flying, lifelink
Pay 7 life: Draw seven cards.

Wall of Bone

Defender (This creature can’t attack.)
: Regenerate Wall of Bone. (The next time this creature would be destroyed this turn, it isn’t. Instead tap it, remove all damage from it, and remove it from combat.)

Emeria, the Sky Ruin

Emeria, the Sky Ruin enters the battlefield tapped.
At the beginning of your upkeep, if you control seven or more Plains, you may return target creature card from your graveyard to the battlefield.
: Add .

Myr Sire

When Myr Sire dies, create a 1/1 colorless Myr artifact creature token.

Surrak Dragonclaw

Flash
This spell can’t be countered.
Creature spells you control can’t be countered.
Other creatures you control have trample.

Temur Ascendancy

Creatures you control have haste.
Whenever a creature with power 4 or greater enters the battlefield under your control, you may draw a card.

Temur Ascendancy

Creatures you control have haste.
Whenever a creature with power 4 or greater enters the battlefield under your control, you may draw a card.

Surrak Dragonclaw

Flash
This spell can’t be countered.
Creature spells you control can’t be countered.
Other creatures you control have trample.

Become Immense

Delve (Each card you exile from your graveyard while casting this spell pays for .)
Target creature gets +6/+6 until end of turn.

Sparkmage Apprentice

When Sparkmage Apprentice enters the battlefield, it deals 1 damage to any target.

Circle of Flame

Whenever a creature without flying attacks you or a planeswalker you control, Circle of Flame deals 1 damage to that creature.

Tromokratis

Tromokratis has hexproof unless it’s attacking or blocking.
Tromokratis can’t be blocked unless all creatures defending player controls block it. (If any creature that player controls doesn’t block this creature, it can’t be blocked.)

Dictate of the Twin Gods

Flash
If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Swarmborn Giant

When you’re dealt combat damage, sacrifice Swarmborn Giant.
: Monstrosity 2. (If this creature isn’t monstrous, put two +1/+1 counters on it and it becomes monstrous.)
As long as Swarmborn Giant is monstrous, it has reach.

Thunderous Might

Enchant creature
Whenever enchanted creature attacks, it gets +X/+0 until end of turn, where X is your devotion to red. (Each in the mana costs of permanents you control counts toward your devotion to red.)

Tromokratis

Tromokratis has hexproof unless it’s attacking or blocking.
Tromokratis can’t be blocked unless all creatures defending player controls block it. (If any creature that player controls doesn’t block this creature, it can’t be blocked.)

Rupture Spire

Rupture Spire enters the battlefield tapped.
When Rupture Spire enters the battlefield, sacrifice it unless you pay .
: Add one mana of any color.