Dynamo Kench

When Dynamo Kench enters the battlefield and
during your upkeep, manifest the top card of
your library. (Put it onto the battlefield face down as
a 2/2 creature. Turn it face up at any time for its
mana cost if it's a creature card.)
Face down cards you control are unblockable.
When a manifested spell you control dies, exile it.
You may cast it from exile until the end of your
next turn.