Erbik, Fluid Caster

Hexproof
{u}{u}: Draw four cards, then put a card on top of your library. You may cast it as if it had flash.
{2}{u}{u}: Draw five cards. Choose three and put the rest in the graveyard. As long as you have a card in your graveyard, you may cast it without paying its mana costs. You can only do this once per turn.