Arcbond | Instant | | Choose target creature. Whenever that creature is dealt damage this turn, it deals that much damage to each other creature and each player. | Slawomir Maniak
Collateral Damage | Instant | | As an additional cost to cast this spell, sacrifice a creature.
Collateral Damage deals 3 damage to any target. | Ryan Barger
Dragonrage | Instant | | Add {R} for each attacking creature you control. Until end of turn, attacking creatures you control gain "{R}: This creature gets +1/+0 until end of turn." | Tomasz Jedruszek
Friendly Fire | Instant | | Target creature's controller reveals a card at random from their hand. Friendly Fire deals damage to that creature and that player equal to the revealed card's mana value. | Anthony Palumbo
Temur Battle Rage | Instant | | Target creature gains double strike until end of turn.
Ferocious — That creature also gains trample until end of turn if you control a creature with power 4 or greater. | Jaime Jones
Wild Slash | Instant | | Ferocious — If you control a creature with power 4 or greater, damage can't be prevented this turn.
Wild Slash deals 2 damage to any target. | Raymond Swanland
War Flare | Instant | | Creatures you control get +2/+1 until end of turn. Untap those creatures. | Karl Kopinski
Cunning Strike | Instant | | Cunning Strike deals 2 damage to target creature and 2 damage to target player or planeswalker.
Draw a card. | Clint Cearley