Promise of Aclazotz {1}{B}
Enchantment
At the beginning of your end step, you may sacrifice a non-Demon creature. If you do, populate. (Create a token that's a copy of a creature token you control.)
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Foul Rebirth {2}{B}
Sorcery — Adventure
Sacrifice a non-Demon creature. If you do, create a 4/3 white and black Vampire Demon creature token with flying.