Drawbridge
Night/Duration - $3
From your deck, set aside (face down) a card, plus an additional card for each unused Buy you have. At the start of your next turn, put the set aside cards in your hand.
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This is gained to your hand instead of your discard pile
Heirloom: Pouch
i like the interplay between "leave buys on the table this turn for a bigger turn next turn" but if you run like...the Market pile with this in your deck, you could have every turn be a Tactician.
Plus, consider like, using multiples of them - you leave two buys on the table and get... 4? 6? 8?! cards on your next turn.
Also you may want to revise the wording on the "From your deck, set aside (face down) a card" lead-in to "... (face down) the top card,..." so it's less ambiguous as to whether you could go through and pull out all the Stashes from your deck.
There are limits to how much you can draw as they have to be set aside at the end of the turn, so you can't reliably draw your deck every turn with Drawbridges. You also can't set aside Drawbridges that will be cleaned up this turn with other Drawbridges.
It's more a card that can be set up around for a megaturn or just one good hand than I put in the free card (even if you have zero buys) so it wouldn't be junk on the turns when it isn't set up well.
It will combo incredibly well with some cards, similar to Rats. The best it can possibly do however is drawing your deck - a great outcome but compared to Bridge (instantly winning the game) or Merchant Guild (setting you up for the rest of the game), it's modest.
I also wanted it to be a relevant consideration on boards where the only +buy you get is the Pouch, including working with Workshop variants. On turns you get the Pouch, it is an Expedition that will occasionally deliver for you later on (in fact I'm going to bump the cost up to $4 just so it isn't strictly better than Expedition.)
The "from your deck" wording is straight from Research (just moved around a bit).