Cassander, God of Secrets

Indestructible
As long as your devotion to white, black, and blue
is less than nine Cassander isn't a creature.
At the beginning of your end step name a
card type and reveal the top of
your library if it matches
put it into your hand, then repeat this process.
{x}{w}{u}{b} Exile a card from a graveyard: You may
cast target instant or sorcery from a graveyard with
mana value X or less. Exile that card.