Sorin, Necromancer

+1: You may sacrifice a creature. If you do, each opponent sacrifices a creature or planeswalker.
-X: Return target creature card with mana value X or less from your graveyard to the battlefield. It gains haste. Sacrifice it at end of turn.
-6: You get an emblem with 'You may cast creature cards with mana value 3 or less from your graveyard'