Convene With Corpses

Soul Anthem — As an additional cost to cast this
spell, behold a Zombie or exile a number of cards
from your graveyard equal to your devotion to Black.

Choose three. You may choose the same mode more than once.
• Mill half X, where X is your devotion to black.
• Create X 2/2 black Zombie creature tokens,
where X is the number of creatures you control.
• Amass X, where X is the greatest power among
creatures on the battlefield.