Enchant creature Enchanted creature gets +2/+0 and has trample. When Rancor is put into a graveyard from the battlefield, return Rancor to its owner's hand.
Official Rulings for Rancor
7/1/2012 : If the target of Rancor when it's cast as a spell is an illegal target when Rancor tries to resolve, Rancor will be countered and put into its owner's graveyard. It won't return to its owner's hand.