I'm trying to combine uranus and thunberbird, and manticore, but nothing happens. I've tried to use the DSS cheat with uranus---I got the card but didn't save it, and now am using the L button trick. Why can't I get any uranus combos to work?

Must be one of the cards that require you press down, forward, up, b button. This is easy to perform, just slide your finger along the right side of the d pad from the down button all the way around to the up button and then immediately press b.