Unown (?)

Flying.
{t}: Tap any number of Elemental Avatar Wizard creatures you control, you may cast a legendary card you own from outside the game or in exile. It cost {2} less of any color of mana for each creature tapped this way.
At the beginning of your upkeep, if Unown (?) is in your graveyard, you may pay {2}{w/u}. If you do, return Unown (?) to your hand.
Cycling {p/c} ({p/c}, Discard this card: Draw a card.)