Sorin, Innistrad's Zenith

+2: Sorin, Innistrad's Zenith deals 3 damage to target creature or player. You gain 3 life
-5: Sorin, Innistrad's Zenith deals damage to target player equal to half their life total rounded down.
-12: You get an emblem with "If you would lose the game sacrifice this emblem shuffle your graveyard into your library, your life total becomes 20."