Avandra the Ebon

+2: Create Two 1/1 White and Black Spirit Cleric tokens with flying and 'When this creature dies, each opponent looses 1 life and you gain 1 life.'
-X: Return target creature with mana value X or less from your graveyard to the battlefield. It becomes a white and black spirit creature in addition
-6: You get an Emblem with 'Creatures you control gain persist and 'when this creature dies, target player looses life equal to its power'