Stonemason + Capital
Have engine with 3 Golds, no +buy, overdraw. Buy three Masons. Mason three golds into 6 Capitals generating $36 and 7 buys.
Timing is fun too, they buy a province, you buy a province, they buy a province, you buy Masons, they scratch their head then buy a province, you buy the rest of the provinces. If they built out to the typical double province engine, you can let them buy two, get masons, watch them buy two more, and then pile out with a 2 estate win.
You can also opt for more golds (7 provinces with 4 gold) or burning a $4 (bringing your total to the magical $40) if you use Mason & overbuy to build your engine.
You can also mill Prov -> Duchy or burn Capitals -> estates if you spike a huge lead, but cannot end the game. 3-piling the turn after is not too hard as you can gain six <$4 cards.
You also do not care about debt in the slightest, so feel free to spike debt whenever convenient once you have the Masons ... bid 40 on the Pass, get the $8 duchy, take a spare Overlord .... whatever, your deck is fully dead to $ so prepare for chapter 7 in style.