I played a game with Tactician and Vault recently. They combo really well together. The main idea is to play a tactician, then on the tactician turn, play a vault drawing up to 11 cards. Discard 8 of them, then play another tactician discarding the rest, then buying a province. Repeat. This doesn't need very much support I found. A bit of trashing is necessary, and if there are attack cards this strategy can easily get destroyed. But otherwise, just open trasher-silver, then trash a few cards, and buy 2 tacticians and 1 vault, and you're good to go. This can choke on green if you don't draw your vault and tactician because your deck got too big. Adding in exactly one sifter can be huge. In this case, cellar is probably better than warehouse, but both work great. The trasher can be pretty much anything I think. Lookout in particular I think would be good because it doesn't trash from your hand, so you can play it and still have enough cards to play vault and tactician. Also, when trashing, once you have gotten your vault and tacticians, you should prioritize trashing treasures over estates. You are never going to play the treasures again, while the estates may give you the crucial couple extra points at the end of the game.
I looked and didn't find an article on the combo yet, which was surprising. I feel like I remember this being talked about before on these forums.
