I've been sitting on this idea for a while and am starting to try and make it something tangible. I'm trying to make a cooperative real time dice game where the players are sieging a city, the city's forces are made up of playing cards. Each suit representing a different type of unit and the number on the card representing it's power. I have a few ideas that I like so far but I haven't been able to figure out the best resolution mechanic. Essentially a 9 playing card will need more to defeat it opposed to a 2 playing card. I've tried toying around with using Farkle rules but for a real time game they are too mathy to do very fast. The other trouble I'm having is that I want troop loss to be a factor as well and I haven't been able to figure that out in conjunction with the main mechanic. I want there to be a push your luck element to players losing troops if they try and take on a high powered card by themselves or if they stretch themselves too thin. I want to promote team play and helping eachother out and "ganging up" on the higher power cards. I want the cards to be able to damage the player attacking it somehow, resulting in troop loss. I feel as though that would make it less of a "just roll until you win" game and more of a hedging your bets on if you can finish this fight or if you need help from a friend because you're losing troops. Also I forgot to mention that I want this to be Timed. Similar to Escape the temple dice game,I want the players to have a certain amount of time to siege the city before enemy reinforcements and wipe them out, this would cause the game to have a frantic nature to gameplay which is what I'm shooting for.
Anybody have any ideas that come to mind on what mechanic could work best and how troop loss could also be implemented?