Metatron Lives!

Indestructible, this spell can't be countered.
{w}{u}{b}{r}{g}: Destroy all permanents. Exile
Metatron Lives! face down with five Aeon
counters on it.
At the beginning of your upkeep, if Metatron
Lives! is exiled and there's one or more Aeon
counters on it, remove one Aeon counter.
Then if there's no Aeon counters left, return
Metatron Lives! to the battlefield.