So instead of, or in addition to, the "slots" way to win cards, it might also be nice to have a "wheel of fortune" that ensures you win a card from your opponent's deck, but includes all the land -- instead of a pretty random chance at a random card, it would guarantee a card, but of variable quality. This might be nice for beginning players to ensure that they get something for their effort. And then the "slots" option could just be for "rare" cards.
M