Concept:
2 Bases (Towers, Def positions and main Base area)
Distruction Enabled
Gear: Flint&Steal, Arrows, Flame Bow, only iron gear
Have rigged for pressure plate TNT (Land Mines, or Command Block'ed for player in area detonation)
First team to destroy main objective, say a stack of resources, via explosion/mining and return goods to there sides chest. Or destruction of there main base.
Limit TNT, but give enough recourse stacks in area to facilitate enough to make more TNT as needed.
Maybe ability to wager a bet (100-10000 MCD) Winner takes all.