Village + Pillage + Graverobber/Rogue.
Works with Feast too of course. But a 3-card combo just to make a 5 gainer is probably too much effort.
Pillage is really, really good though - and you can use any village so there's a lot of different options. It feels like a pin, that's how strong it is (if you can play Pillage every turn).
A pillage every turn is a pretty strong move, maybe not strong enough to be called a pin though. Definitely will dismantle most engines and will rip apart big money's hopes at provinces.
You'll need pretty good drawing and/or deck control to manage to play it every turn. Do you think you can set it up quickly enough and keep it in place while greening? If your opponent builds a more conventional deck and starts going for duchy while the pin is in place they might be able to still do competitively.
Hmmm....but now I remember that Pillage gives you 2 Spoils. That means you don't need to worry about building your economy, because when you activate the pin you've basically added +$6. This makes it a lot more viable than I was thinking.
Can't wait to try this idea out!