This is something that constantly eludes me. I look at the cards and think about what would work best with what, and I just can't seem to come up with a good build on my own. I've been wracking my brain trying to figure out some kind of strategy, and I just can't wrap my head around it all. So I figured I'd ask:
What sort of things should I think about when I'm picking fighters and upgrades? What do you think about? What sort of things should I avoid?