Boo's Crystal Ball
From the Super Mario Wiki
The Boo's Crystal Ball as seen from Mario Party 4.
Boo's Crystal Ball was an item featured in Mario Party 4. A player could use the item to summon a Boo to steal coins or a Star from an opponent. Boo's Crystal Ball could be purchased at item shops or won in Mini Mini-games. The only reason why it replaced the Boo Bell from older Mario Party games is because it showed players their opponent getting robbed by the Boo.
