As I have posted on another thread, I think the cards we already have could use a bit of tweaking, to make them more worthwhile to spend four scoops on. Here’s my suggestion, as pulled from that other thread:

     bumhole destroys twelve scoops as follows:

       - six at random from the top player in the bracket

       - three at random from each the second and third highest players in the bracket.

     Destroyer destroys two chosen scoops from one player.

[new]Lotus Position generates three scoops of one flavour.

     Modest Improvement generates two chosen scoops.

     Peeping Tom lists all of one opponent's cards and lets you:

       - steal one card at random

       - break an active shield at random

     Shield protects you from the card type of your choice:

       - bumhole

       - Destroyer

       - Shotgun

       - Thief

     Shotgun destroys two random scoops from each of two players.

     Switcheroo stays the same because it's cosmetic.

     Thief steals from each of two players one scoop of a chosen flavour.

Quite simply, the thing to remember is that every card you buy costs you four scoops. The reward needs to be close to four scoops (and preferably less than four) to be anything resembling balanced, and most of the existing cards already do that.