How rare even are the legendaries? Because I got one at some point, and I've opened at least a hundred card packs since, but I've yet to see another one.
When they're colored, it means they've been "tributed" three times, which is the max. It'll do that with your cards too if you tribute to a single one three times and all three succeed (you should also see 3 little icons at the top of the card if it succeeded).
It would be nice if after beating the league, there was a way of more easily accessing things like level-ups, tributes, and evolutions, so you can just play around with different builds, without having to wait for those to come up while beating a bunch of train
Just started playing this game, it's really fun so far! However, twice now, I've had a fight with a trainer, and all they did was draw cards, they didn't play anything, even though with 5-7 cards, you'd think they would have something to play.