Hmmm… It could be possible with a frenzy Quahog and three operants.
Magmar VS Abyssian. Abyssian has 3 opperants, a Deciptibot, QWEQRTYJDFGX (you know who), and the rest, non-mech 2 drops. Magmar has Quahog, one Primal Flourish generation card, Moloki Huntress, Kraigon, Diretide Frenzy, QNFIODHJFSDVJSB (you know who), and the rest 2 drops.
Abyssian gets out the operants using Deciptibot, and then one player plays QFJGDFKNGFBD to get rid of everything else. Then the rest is just about using frenzy Quahog to repeatedly kill operants until the deck is full of Mechs. Be wary though; you have to kill one mech a turn with Mag general + Kraigon or else your hand will fill up. Flourish + Moloki helps keep Quahog alive. Fractal replications can also be helpful in making this more efficient, since they let you get up to 6 operants per turn, instead of just 3.
However, I am too lazy to test this at the moment.