Hi,If I play "rise again" or "animate dead" on a creature of opponent ,do I become the controller and owner of the creature?Can I destroy it on the sacrificial altar?Thanks
ACG is correct. You become the controller because you will be the one casting the creature with the reanimate effect. However the owner never changes. If the creature dies again it will go back to your opponent's discard pile and he will get to take it back home with him at the end of the game .