From the Super Mario Wiki
The Miracle Capsule is a type of Capsule that only appears in Mario Party 5. Unlike other Capsules, a Miracle Capsule cannot be thrown onto the board or used by the player on themselves (though it can still be thrown away). If a player obtains three Miracle Capsules, Eldstar will appear, and all of the first place player's Stars are given to the player in last place. If the player in 1st place gets all three Miracle Capsules, none of their Stars are given to those in last place.
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