Soul Keeper

Flying
{t} exile target creature under Soul Keeper. Put 3 time counters on Soul Keeper. When the last time counter is removed, put a 2/2 green Fairy creature token with flying onto the battlefield.
{4}{w}{t}: Put a creature exiled by Soul Keeper onto the battlefield. It becomes a white spirit creature in addition to its other types. Exile it into its controllers exile at the beginning of your endstep.