Dream Succubus

When Dream Succubus enters the battlefield,
exile another target tapped non-Demon creature.
When Dream Succubus leaves the battlefield,
put the exiled card onto the battlefield under its
owner's control at the beginning of their next
upkeep. It becomes a black Demon with base
power and toughness 5/5, loses all abilities, and
gains flying and haste until end of that turn.
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"There is more than one demon here."