Horn megaturn seems viable here IMHO, but I have only pulled it off a handful of times, so I'm not the best judge. The 8 cards would be HoP, Copper, Silver, Gold, TR, Margrave, Mystic, and probably shanty town and/or pawn. The problem there is Mystic and Margrave are the same cost, so I'd probably swap pawn for mystic, since you need the margrave for the draw.
Alternatively, I a mystic/TR/Margrave engine with HoP used as a gainer would probably be more viable, and probably convert the horns into points at the end. I would ignore shanty town (except maybe one near the beginning when you can't hit 5) because TR mystic is a far greater village. Secret chamber might be ok, but I like the idea of the only terminal being margrave, since it + mystics should get you all the money you need. That's my amateur evaluation, experts please correct me.