Slumbering Regigigas

Start the game with Slumbering Regigigas already in play with three Slumber counters on it.
Indestructible
At the end of each player's turn, if there are any Slumber counters on Slumbering Regigigas, add Slumber counters to it until there are three. If there are no Slumber counters on it, Transform Slumbering Regigigas instead.