Unstable Replica

You may have Unstable Replica enter the battlefield as a copy of any artifact on the battlefield, except it's an enchantment in
addition to its other types.
At the beginning of your upkeep, flip a coin. If
you lose the flip, create a token copy of Unstable Replica under target opponent's control. Exile Unstable Replica and return it to the battlefield
under its owner's control at the beginning of that player's next upkeep.