Warp Dice Block
From the Super Mario Wiki
The Warp Dice Block is an item that appears exclusively in Mario Party DS. It can be purchased for two coins in any shop. If the player uses it, they are said to be warped to a random space on the board, but it actually just warps them one space behind them, really only being useful when the player is shot into the Bowser Zone, being used to get out. Then they will be able to roll the dice block from there. It can be considered a variant of the Warp Block used primarily in the early Mario Party games, which enables the player to switch places with another character at random. The player who used the item experiences the effects of the space on which he or she landed. Computer players never buy this item when they go to the item shop.