Ermac, Concentration of Souls

Ward - Sacrifice a creature
Myriad

Ermac, Concentration of Souls gets +1/+1 for each creature in all graveyards.

{b}{g}, Exile a creature from a graveyard: Create a
1/1 white spirit creature token with flying. If the exiled creature was legendary, instead, create a 2/2 black and white spirit creature token with flying and lifelink.