Aeva, Vengeful

Whenever a creature you control dies, put a soul counter on Aeva, Vengeful.
Remove X soul counters from Aeva, Vengeful: If
X is at least one, Aeva, Vengeful gets +2/+0 until
end of turn. Additionally, if X is at least three,
Aeva, Vengeful can't be blocked this turn.
Activate only once per turn.