Cosi, the Trickster

Menace, indestructible
Exile two instant cards from your graveyard: Put
a belief counter on Cosi, the Trickster.
Cosi, the Trickster can't attack or block unless
there are at least five belief counters on it.
At the beginning of your end step, you may cast
an instant card from your hand without paying
its mana cost.