Twilight Omnipotent

+2: Draw a card, then discard a card from your hand. Until your next turn, you may cast that card from your graveyard. If you don't, exile it.
-1: Each opponent discards a card. You gain 1 life for each instant or sorcery card discarded this way.
-12: You get an emblem with, "You may cast nonland cards without paying their mana costs."