Mark of the Oni {2}{B}
Enchantment — Aura
Enchant creature
You control enchanted creature.
At the beginning of the end step, if you control no Demons, sacrifice this Aura.
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Cards that do something similar expected a card that isn't here?
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Chorale of the Void 86%
$0.29#11271
"At the beginning of your end step, sacrifice this Aura unless a nonland permanent left the battlefield this turn or a spell was warped this turn."