Mirror, Mirror – A special Shield card. Upon picking it, you choose a specific kind of card to shield against. All other cards bypbum it, but when someone uses that specific chosen card it blocks it as a Shield and uses the same effect on whoever played the card. (If the opponent was trying to use a Thief to steal a Vanilla scoop, Mirror, Mirror takes one of HIS vanilla scoops and gives it to you. If he has no vanilla scoops, Mirror, Mirror does nothing more than shield.)

The kind of Mirror, Mirror you have can be seen with a Peeping Tom. Mirror, Mirror can be in play at the same time as a Shield, but will have first priority when it’s chosen card is played against it.

A few mirror cards were already mentioned, but this seems like a good way to balance the idea and make it less overpowered and more strategic.