For those who don't know what One of Everything is, well, basically, you have all weapons, but they're all limited to a single ammo. And if you use up a weapon, it won't reappear in further rounds (anti-stockpiling mode). Knowing that, you have to win 3 rounds (best of 5).
Worms per team: 4 worms per player (= 8 worms per ally).