Magus of the Arena

Creature - Human Wizard

, : Tap target creature you control and target creature of an opponent's choice they control. Those creatures fight each other.

The magus still hears the roar of the crowds. They're gone, but the will to compete remains.

5/5

2007-02-01 If an effect changes the targets of this ability, the second target can be changed to any creature the chosen opponent controls. The choice of opponent can't be changed.
2007-02-01 If either target leaves the battlefield before the ability resolves, the ability taps the remaining target, but no damage is dealt. If both targets leave the battlefield, the ability doesn't resolve.
2007-02-01 Magus of the Arena's controller always chooses their creature first.
2007-02-01 Tapped creatures can be targeted. Tapping them again will do nothing, but they'll still deal damage.

Card is in preconstructed decks:

mtg.wtf