User blog:Skardae/Key Cards

I've looked into the articles over on BF Theory, and tried a few games with some un/commons I picked up. However, it seems like there are RR and RRR cards which I'd need to make my decks work. Since I'm not sure what kind of deck I like yet, I want to go for cards that I could put into whatever build I decide on.

So, the question this time is: What cards for different worlds are good for any deck that world builds?

I'm looking into:

-Dragon World

-Magic World

-Hundred Demons

-Dungeon World

-Ancient World

-Hero World

I'm mainly looking at RR and up cards, since I don't want to invest in a costly set of cards that only work in one deck, then find I don't like the play style.