Custom Dice Block
From the Super Mario Wiki
The Custom Dice Block (Lucky Number Dice Block in Europe) is a usable item in Mario Party: Island Tour. It acts just like a Dice Block, with the exception of the player choosing how many spaces to move, similar to the Slow Dice Block. It has a rainbow design, similar to the effects of a Super Star. The player may obtain it by either winning an item minigame or landing on an Item Space.
If the dice is rolled along with the Bronze, Silver, or Gold Dice Block, the total number will be added together. If the player was hit with a Blooper Chopper or a Lightning Score Striker, the total is reduced to a lower number.