Jaithys, The Prison Blade

Vengeance, Vengeance, Vengeance (Whenever
one or more cards are exiled from your graveyard,
this creature gets +3/+3 until end of turn.)
Whenever Jaithys attacks, you may exile a card
from your graveyard, if you do, Jaithys gains
double srike until end of turn.
"Begin the feast of souls"