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.
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