The Koopa Kard is an item that appears in Mario Party 3. This item is rare and cannot be obtained by normal means.
The Koopa Kard can be used to help get the coins from a Koopa Bank Space without having to land on the space itself. This card should be used when a lot of coins is in the bank. The only ways to obtain a Koopa Kard is to either receive it as a gift from Toad or find it in a Hidden Block.