If using magical tractors for Tractor of Doom scenario, which I think is the best way, then the tractor models should be given a source of mystical light on the roof, like the light on the Tardis:
https://encrypted-tbn2.gstatic.com/imag ... i7-iNLpFlQ but gold-coloured.
From this lightsource it would shoot beams of energy. Maybe it could be a TOW weapon.
It's HP should be really high, given its supernatural nature. Maybe HP, four or five times that of a tank.
From a technical point of view, the magical tractor has a human driver, but the tractor weapon should be AI controlled. This is because its magical power cannot be fully controlled by man. Therefore, it would need to be programmed to have an "in-built" AI gunner with infinite life until the tractor is destroyed. It would not be necessary for a human driver to be driving the tractor for it to fire because of its supernatural power.
It could also be set up so that whoever has the higher score in that particular game, can carjack friendly vehicles (the tractor), like the out-ranking system in the regular game. This is in case the tractor is being driven by someone who doesn't realise the full potential of the magical powers that the tractor can bring to the battlefield.
This is an artist's concept of how I think the Tractors of Doom mini-game would play out:
