From the Super Mario Wiki
The Mushroom Orb is an item capsule that first appears in Mario Party 5, replacing the Mushroom item from previous Mario Party games. It can be thrown to a space on the board, or used on the player for five coins. In Mario Party 6 and Mario Party 7, it is an orb that players can only use on themselves. It costs five coins at the Orb Shop. Otherwise, the effect is the same. The orb gives the player the chance to use two dice blocks instead of one. Rolling a double number results in ten or thirty coins for the player. In Mario Party 8, this orb is replaced by the Twice Candy, which has a similar function.
Mario Party 6 and Mario Party 7