Balls ;)

Some children playing Battle Balls

Battle Balls is a parody of Bakugan, a kids TV show and strategy game involving balls and cards. The characters in the game are identical to the real Bakugans. Some fans believe that the  game is actually not a parody. Bart and his friends played with them, and Marge suspected that he was doing drugs.In the simpsons battle balls are a Japanese card game based on a cartoon based on a ancient religion based on a candy bar.

The known cards are

Platinum lavagini

Battle card digitate

defence card deflecto warp

dubaki goji kick

unnamed orange ball that uses a drill

an unnamed butterfly

an unnamd snow man that shoots carrots