Ghidorah, Who is All

Flying, Trample, Annihilator 2
you cannot cast spells from your hand
if you would draw a card mill that many instead
you may cast spells from your graveyard rather than your hand, spells cast this way you may pay 2 life rather than colored mana costs for each color symbol, if you cast an instant or sorcery this way it is shuffled back into the deck rather than put into the graveyard