The True

: All Elder creatures you control have Indestructible and Trample and +X/+X, where X is your total devotion to Blue and Black.
+3: Search your Library, Graveyard or Exile for a Elder Card, put it into your hand. All creatures you control get 2 +1/+1 counters.
-15: The True becomes a 10/10 Elder God creature with Shroud, Trample and Indestructible. It is still a planeswalker in addition to a creature.