Caelestibus, Symbol of Piety

{2}{w}, {t}: Exile target creature or artifact, and put
an unseal counter on Caelestibus if it isn't
unsealed.
{w}{w}: Untap Caelestibus. This can only be used
while Caelestibus is tapped and unsealed.
Sealed 3 (This creature cannot attack or block unless it
has accumulated 3 unseal counters. Once it has 3, the counters are removed and Caelestibus is unsealed.)
Flying, lifelink, menace