I liked it a lot, but definitely had the feeling that I had no ability to choose abilities in a smart way - with the way the cards' power scales up, old cards are quickly completely obsoleted, so whether or not I choose cards that diversify my colour palette was not particularly meaningful... because the viability of old cards really quickly drops to 0, and if my latest ~6 picks aren't good enough, I feel like I'll probably die.
Really cool idea and great presentation. I enjoyed playing it.