Ixaac, Undefeated Batallador

Assault (When this creature enters the battlefield, you
may exile it. If you do, it deals damage equal to its
power to any target. If you target a creature you
control this way, this deals damage to it in the form of
+1/+1 counters.)
You can't cast noncreature spells.
Whenever a creature you control deals damage
equal to its power to any target, put a +1/+1
counter on Ixaac, Undefeated Batallador.