Mutant’s Prey

Target creature you control with a +1/+1 counter on it fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

Domri Rade

+1: Look at the top card of your library. If it’s a creature card, you may reveal it and put it into your hand.
−2: Target creature you control fights another target creature.
−7: You get an emblem with “Creatures you control have double strike, trample, hexproof, and haste.”

Gruul Ragebeast

Whenever Gruul Ragebeast or another creature enters the battlefield under your control, that creature fights target creature an opponent controls.

Pit Fight

Target creature you control fights another target creature. (Each deals damage equal to its power to the other.)

Guild Feud

At the beginning of your upkeep, target opponent reveals the top three cards of their library, may put a creature card from among them onto the battlefield, then puts the rest into their graveyard. You do the same with the top three cards of your library. If two creatures are put onto the battlefield this way, those creatures fight each other.

Prey Upon

Target creature you control fights target creature you don’t control. (Each deals damage equal to its power to the other.)

Rivals’ Duel

Choose two target creatures that share no creature types. Those creatures fight each other. (Each deals damage equal to its power to the other.)

Blood Feud

Target creature fights another target creature. (Each deals damage equal to its power to the other.)

Daybreak Ranger // Nightfall Predator

: Daybreak Ranger deals 2 damage to target creature with flying.
At the beginning of each upkeep, if no spells were cast last turn, transform Daybreak Ranger.

Prey Upon

Target creature you control fights target creature you don’t control. (Each deals damage equal to its power to the other.)

Rivals’ Duel

Choose two target creatures that share no creature types. Those creatures fight each other. (Each deals damage equal to its power to the other.)

Magus of the Arena

, : Tap target creature you control and target creature of an opponent’s choice they control. Those creatures fight each other. (Each deals damage equal to its power to the other.)

Arena

, : Tap target creature you control and target creature of an opponent’s choice they control. Those creatures fight each other. (Each deals damage equal to its power to the other.)

Contested Cliffs

: Add .
, : Target Beast creature you control fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

Triangle of War

, Sacrifice Triangle of War: Target creature you control fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

Arena

, : Tap target creature you control and target creature of an opponent’s choice they control. Those creatures fight each other. (Each deals damage equal to its power to the other.)