Izaxaru, Dream Seeker

When Izaxaru, Dream Seeker enters the battlefield, search your library for a non-sorcery,
non-instant card and exile it.
At the beginning of your upkeep, you may pay {w}{u}{b}. If you do, gain control of target
permanent with CMC equal to or less than the
exiled card. If it is a creature, it gains flying and becomes a spirit in addition to it's other types.