Slow 'Shroom Orb
From the Super Mario Wiki
The Slow 'Shroom Orb (Sluggish 'Shroom Orb in Mario Party 6) is an orb in both Mario Party 6 and Mario Party 7. When used, it slows down the speed of the Dice Block tremendously and rolls the number in order, allowing players to choose any number from 1 through 10 to roll. Players do this by hitting when the number below the desired outcome is shown on the Dice Block; if a player wants to get a three, then the player is to hit when the Dice Block shows a two for example. They are one of the few Orbs used in the Solo Mode in Mario Party 6.
This item has a similar effect to the Slowgo Candy from Mario Party 8 (though the Slowgo Candy reduces the maximum roll, where only numbers 1 though 5 appear) and the Slow Dice Block from Mario Party 9.