Lucid Dreams

Enchant creature. When Lucid Dreams enters the
battlefield, tap enchanted creature. You may
choose not to untap it during your untap step.
At the beginning of each upkeep, exile the top
card of your library face down.
When enchanted creature becomes untapped,
sacrifice Lucid Dreams. Enchanted creature
gains the abilities of all creatures exiled with
Lucid Dreams for as long as they remain exiled.