Ryoubi, Blazeheart

Vigilance, oathbound (Whenever this creature is dealt combat damage by a creature, you may swear this creature against that creature.)
Whenever a creature that Ryoubi swear against attacks or blocks, put a +1/+1 counter on Ryoubi.
{1}{r}, {t} : Ryoubi fights target creature you
don't control. (Each deals damage equal to its power to the other.)