Okay, let's say the hero (looking more and more like a villain...) has gathered the ridiculous gardens deck - (50+ coppers - well, after this turn he'll have 50+ of them), 40+ silvers, 16 or so potions, and 10 or 9 of every other kingdom card than TR (which he has 8 of) and saboteur and King's Court and fairgrounds. So his gardens are worth about 20 each - so about 160 there. Then plus vineyards brings him up to 304, plus whatever number of estates he has. Now let's see how much more he can get...
It goes without saying that he has an enormous number of philosopher's stones with him, worth over $10 each. He scrying pools all his actions in one massive hand, drawing some worker's villages and other sources of +buy. Eventually, using the one $6 card - goons (I don't know how many +buy you can get from <$4 cards), and secret chambering down to just his philosopher's stones, he purchases a bunch of colonies, provinces, duchies, and fairgrounds and maybe coppers, trashes 10 quarries and 10 talismens with TR'ed bishops. (+30 vp) Obviously he wins because his opponent has ragequit already.
I'd have a chain of cards he could play but this margin isn't sufficient to contain it :p