From the Super Mario Wiki, the Mario encyclopedia
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The 20-Coin Hex is a type of Hex in Mario Party DS that can only be found on the main board. The player who possesses it can choose to place it on any Blue Space or Red Space within a five spaces from their current location. Then, if an opponent lands on it, 20 coins will be taken from them. However, if that player had no coins, the Hex would fail and have no effect, whatsoever. If the player/team who threw it lands on it, the hex will be canceled out, but they will receive 5 coins. It can be picked up in the Hex Area or via stealing it from another player with a Snag Bag.