Skyja, The First

Flying, Vengeance (Whenever one or more cards
are exiled from your graveyard, this creature gets
+1/+1 until end of turn.)
At the beginning of each upkeep, if you have
fewer than nine Angels, you may exile a card
from you graveyard, if you do, create a 4/4
white and black Angel with flying and vengeance.
"Valkyrie, slay them all."