[zenith]

I'm not sure having complicated restrictions based on level/stats is going to work out well. Given the fact you can attack anyone at any HP status, powerful players are going to fall to players they don't normally lose against.

How about we score this based on how many levels you defeat? That way you are most effective for your team by attacking players with the most levels you can possibly gain per attack. Would be a waste of energy to attack the player who is 20 levels lower than you when you can take out the person 4 levels lower than you.