Gnomish Combobulator

{2}, {t}: Flip a coin. If you win the flip, manifest
the top card of your library. If you lose the flip,
Gnomish Combobulator doesn't untap as normal during your next untap step.
If you control a face down instant or sorcery
card, you may pay its mana cost and exile it. If
you do, cast it for {0}. It gains Shroud.