I always thought that dual-type both in weakness and in element really spices up the thing. Like, major spice-up. Which is why all my fake cards I do has that included.
I'd also like to see the psychics, actually ghosts, get their special status infliction - curse. It would be very interesting the way I see it. Or more statuses. Freeze, for example, and altered paralyze. One works for a turn, the other stays but is flipped.
Additionally, I'd like to see more creative move names, because "Extra flame" is just person. I always thought that half the magic in cards was in variety of attacks. Which is why I'd also like to see more stuff involved. Not necessarily more effects, but more of less-used. For example, dealing damage based on specific cards used to energize or used as basic Pokémon, or abuse of opponent's deck. Et cetera.
About the holos, well, it might be interesting to start including moving graphics. When you flip the card, it displays a performance. A story. It's an old element, but quite forgotten now-days.
