Level 1:
Dice: Cait Sith rolls two dice. He then does damage to all opponents equal to the amount on the dice X 100.
Level 2:
Slots: This works similar to Tifa's slot machine style limits. Depeding on which pictures come up, any number of things can happen. It's even possible to instantly kill any enemy, even Sephiroth.
To get this, Cait Sith must simply kill 80 enemies.