True to form, Cait Sith is just as random and useless here as he was in Final Fantasy VII. His main ability affects only the weakest of cards. His special ability is only marginally stronger, and only when it works; especially damning is the fact that the cost to execute Slots is outlandishly high. As a whole, this card's abilities cannot even justify a summoning cost of 3 CP.
It is highly recommended that you keep this card out of your deck, if you plan to play at all seriously.