Warbriar Blessing

Enchant creature you control
When Warbriar Blessing enters, enchanted creature fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)
Enchanted creature gets +0/+2.

Foundations Jumpstart

The List

Wilds of Eldraine Commander

Enchant creature you control
When Warbriar Blessing enters the battlefield, enchanted creature fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)
Enchanted creature gets +0/+2.

Theros Beyond Death

If Warbriar Blessing leaves the battlefield before its enters-the-battlefield triggered ability resolves, the creature it last enchanted before it left will be the one to fight.

If the target creature is an illegal target when Warbriar Blessing's triggered ability tries to resolve, the ability doesn't resolve. If the enchanted creature is no longer on the battlefield, the target creature won't deal or be dealt damage.