Necromatic Prefection

{t} Sacrifice any number of zombies you control, create a X/X blue zombie creature token where
X is the total toughness of all creatures sacrificed
by this ability.
{t} Sacrifice any number of zombies you control, create X 2/2 black zombie creature tokens where
X is the total power of all creatures sacrificed in this
way.
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When Gisa and Geralf teamed up they were unstoppable