if you could get a swarm of antweight really controlled...
i'd hate the repairs afterwards, when many got sacificed, but just imagine 50 mini-wedges swarming to your bot from all sides, drive under you (maybe you can flip a few to the moon or shred some more to dust, but enough will get through) and just drive you (with themselves) in the pit, while more than 50% of them stay safe.

If you can control that...

Okay, active weapon rule... pff... give them all a mini-lifiting arm or something o0.

Well, obviously less effective in a 4-way-melee, since you most likely can't sacrifice enough to beat more than one without getting more than half your bots destroyed. but still... interesting idea.