Alkri, Master of Silent Skies

Creatures you control have flying and haste.
Creature cards you own that aren't on the
battlefield have {2}{u}{b}{r}: Put this card from
your hand onto the battlefield. Exile it at the
beginning of next end step with a Silence
counter on it.
Cards you own with Silence counters on them
have {u}{b}{r}: Return this card to your
hand from exile.