Phoenix

Flying, indestructible
Gods and creatures lose indestructible while Phoenix is in play. Abilities of Gods no longer trigger, even if they trigger upon discard.
Creatures under your control gain +1/+1 on your attack step.
Supernova — {7}{r} Discard Phoenix. Destroy all opposing creatures.
Ashes of Rebirth — {4}{w} Reshuffle all creatures from your graveyard back into your library. Discard Phoenix.