Creature â Demon
When Reiver Demon enters the battlefield, if you cast it from your hand, destroy all nonartifact, nonblack creatures. They can't be regenerated.
If a creature (such as Clone) enters the battlefield as a copy of this creature, the copyâ€™s â€œenters-the-battlefieldâ€ ability will still trigger as long as you cast that creature spell from your hand.
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