Mass Necrotic Celebration

Exile all creatures from target players graveyard,
then sacrifice any number of creatures. For each creature sacrificed this way, place a creature
exiled this way onto the battlefield under your
control and create a 1/1 black Bat creature token
with flying.
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"All should get to experience Hallows Eve! Even those past dead and the ones who eat flies off of them. Especially
those past dead..." - Ghoulcaller Gissa