We're playing Savage Worlds these days which uses cards for initiative, and loving it. Applying the same idea to the combat dice rolls would rock as well. Try this Glenn: a pit-fighter/gladitorial combat between two models. You've got the full deck and two jokers. You'd have to basically construct a hand, or use an alternating card system to determine the outcome. I'd try it one on one first, and see if it takes.
Ye know... almost sounds like a spades game with a twist. Might be something to think on...
Each player gets five cards.
p1: 2,5,10 of Hearts; K of Clubs, Ace of Spades
p2: 3, 4 of Diamonds; Queen, 10 Clubs, 6 Diamonds
Now, if all cards are equal and the only trump card is a Joker, this can make for some ties- which in a fantasy setting means it was a blocked attack. ( Nice when you think about it)
Look up above p1 starts with 10 of Hearts, looking to make a mark rather fast. P2 Counters 10 Diamonds for the block
p1 throws 5 of hearts, trying to feint and p2 counters with his 6 winning (p1 model takes a hit)
p2 turn to go first and he tosses his Queen... countered by the King (Back to p1 lead
P1 tosses his Ace... to p2 three.
p1 then sends his two out there to be pummelled, which p2's 4 does.
p1: Suffered 2 hits
p2 Suffered 2 hits
With five cards, I would make it 3 hits to drop.