an scenary with equal amount and type of random militar units without sources etc just and arena, 1vs1 or team 4vs4 multiplayer where the team with the last soldier alive wins
Teams appear on an arena with the same units and the map revealed or not thats an option, all units with the same hitpoints and all stats the same, to win they fight each other until the last unit is alive. The team with the last unit alive add 1 point to the score. We can decide hoy many rounds of battle we can play from 5 to 50, every round loads different groups of combined units, randomly, but with equal stats for everyone.
After finishing all rounds of battle, the team with the best score will wins elo.