Combo: Tactician + Mission (or Outpost?) (+ saver)
I did some searching and couldn't find this combo anywhere, so I present it here for consideration.
The issue with double-tac is that you have to accumulate virtual coin. This combo allows you to basically play double-tac with regular ol' treasure. Tactician already gives you a +buy, so after very little treasure upgrading, each buy phase is: Colony/Province, mission. On your mission turn, all you're doing is drawing your other Tactician and playing it, setting up a ten-card hand every "real" turn.
It works especially well with ways to guarantee the Tactician on the Mission turn (Haven, Gear, Save.) This can turn the deck into a 100% shuffle-luck-proof auto-buy machine.
Comments? Should the wiki article list Mission/Outpost as synergistic cards with Tactician since it gives you something extremely worthwhile to do on an otherwise suboptimal nerfed "extra turn?" Or does the combo rely too heavily on a saver or shuffle luck (or perhaps a stacker like Cartographer, or a sifter like workshop when your discard pile is empty and your other Tactician is already in your hand? Other ways to ensure a Tactician on the nerfed turn?) Or are Mission/Outpost more abusable than I'm imagining? Maybe it only works on non-engine boards?
This came up in a game and I had it absolutely in the bag, except that I lost count and trashed one too many coppers, leaving me with 14 coin each turn reliably. Oh, wait. Colony + Mission is 15. Can I go back two turns and get that copper back? Lost by one Colony when I had to use a buy to set back up. D'oh! To quote David St. Hubbins, "It's a fine line between clever and stupid."