Gondar, Jungle's Spirit

Gondar, Jungle's Spirit enters the battlefield as a
copy of target creature you control.
You may look at the top card of target player's
library at anytime. If it's a creature card, exile it.
That player may play it at anytime from exile
only by paying it's mana cost. You may cast that
card only from exile by paying it's mana cost
except you may play it with {5} instead.