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Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types.
Interesting card. If you have a possibility to sac creatures (like Witch Oven) with enter the battlefield triggers (like Goose or the M20 Elemental Knights)) , you can reuse them.
And he has an 4/4 flying body. In limited a bomb for sure, it's may be an useable card for other formats, too.