Star Rod (Mario Party 8)
From the Super Mario Wiki
The Star Rod is a magic wand that appears as the reward for becoming the Superstar of the Star Carnival in Mario Party 8. After completing the game's Star Battle mode, MC Ballyhoo will award the player with not only a year's supply of Candy, but the Star Rod itself, which he had been carrying in Big Top all this time. However, Bowser swoops down and steals the rod, claiming he's the real Superstar. The player then chases Bowser to his board, Bowser's Warped Orbit, where it is recovered after the player beats one of Bowser's minions, and used to create energy balls that attack Bowser in Superstar Showdown.