Hm.
Colony, Cutpurse, Explorer, Jack of All Trades, Market, Masquerade, Philosopher's Stone, Platinum, Potion, Royal Seal, Shanty Town, Thief, and Vault.
There's no +cards/+actions engine to be made, not with shanty town/vault. Can't make a cantrip engine with just markets, not at good one at least.
Very weak board for a Colony game.
There's trashing with Jack and Masq. I'd guess Masq is better because you want the copper-trashing in a colony game. So one option I see is to open Masq/silver, then go for BM with vaults.
Sim tells me masq is better than jack.
An option would be to add a potion and PStones; Pstones could be worth a lot with vault to discard most of your hand. In that case, open potion/silver, get vaults and pstones. I'm skeptical though. Sim tells me this sucks.
Thief could be a gamble. If you hit one plat with it at the right time, that's a big game swing; if you hit two plats, that's gg. Sim tells me getting a thief does not help on average, but if you get behind by a few lucky draws (like if your opponent hits 6 for gold or 9 for plat way too early, I bet it could be worth a gamble. Dunno. Definitely not the plan A.
Vault/Masq/BM is good enough that it can get to colonies and can't be beaten by a straight province rush with jack, vault, or masq, I think.
Man I'm not seeing anything better than Vault/Masq/BM. Too many terminals in that anyway to like a cutpurse. Could come down to luck of who gets $9 for plats vs $8 for golds.
Is there anything there that I'm missing? How'd the game actually go?