Gyllian Form Master

When Gyllian Form Master enters the battlefield,
exile the top card of your library. If it's a creature
card, you may have target creature become a copy
of it as long as it remains exiled.
When Gyllian Form Master leaves the battlefield,
put all cards exiled with it into their owner's
hand.
_________________________________________
"The Lore Ward has certainly not sent me off alone."
-Kyoniq, planeswalker