Here's my two cents: There are a few different types of visual card sleights (i.e. sleights that the audience sees, rather than the hidden kind that they're not supposed to see):
- card flourishes like certain cuts and shuffles, which aren't in any way magical.
- card manipulations, which are supposed to be magical, but the audience secretly knows exactly what you're doing.
- card sleights, like colour changes, which are magical
If you perform tricks that are magic (i.e. defy the laws of physics) you'll probably want to learn sleights from the third category: If you perform tricks that are technically not magic (i.e. defy the laws of probability and statistics), only then do I think that learning skills in the first category is worth it.
I'm interested in all three, to be honest. I do other things, like juggle and poi (ocassionally), and I see cardistry falling into this category.
I'll also say, don't add visual pizzazz to a trick just for the sake of making it more visually impressive, if it detracts from the story. It's easy to imagine, for example, a movie with lots of special effects but a mediocre story vs. a movie with no visual effects but a great story: the second one will always be better of the two. If the visual sleights add to the story, however, go right ahead and include them.
As I said before, I look at cardistry more as a hobby outside the realm of magic. So the purpose is not to add pizzas (jk, pizazz) to my magic. Its just to impress people (and myself) for what it is, separate from magic. However, I do think it will, in some ways, be incorporated into my magic.
With that being said, what would you suggest/recommend?