Anyone ever played? Here
It's like an RTS/MMO/CCG hybrid, thing.
Very well polished RTS, it's essentially 100% free on steam, as you get a basic deck, and the ENTIRE campaign to play.
If you buy it you get more decks(units and spells), and points to spend on more cards.
It's actually moderately hard to describe, game wise, just a very cool, non base-building type RTS, with spells and fantasty creatures galore.
I haven't really scratched the surface yet, but it seems like it would be very deep and complicated once you got below the cool graphics and special effects.
Worth at least a whirl to see if you like it, like I mentioned, it's totally free on Steam through the demo, so not much to lose.