Recycle
Night - Reaction
$5
Trash a card you have in play to gain a cheaper card onto your deck.
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When you gain a card, you may reveal this to trash that card and gain a card costing less than it.
Lets you get one last use out of a card before trashing it, and then gives you a cheaper card, which you can use on your next turn. It has obvious synergies with cards that have on-trash abilities. You can, for example, get a free $3 card out of a Fortress. Near the end of the game, you can also cannibalize Golds into Duchies, or Hunting Grounds into
two Duchies (or a Duchy + some other $5 card), although those Duchies will go straight onto your deck. You could also use it to trash Coppers, and receive nothing, but it's not exactly the most efficient Copper-trasher. You can't trash curses or Estates with it, though
The reaction's usefulness is heavily contingent on the rest of the kingdom. It would synergize *very* well with Fortress, especially with Workshop variants, as you'd simultaneously receive a Fortress to hand and another $3 card. Rats would also work great with it, since you can trash the gained Rats with the reaction, and then trash the played Rats with the Night phase ability. And cards with on-gain bonuses, such as Flag Bearer, would be useful with this too. Get the flag and a $3-cost card for $4. With cards like Soothsayer that allow you to gain a Gold, you can use them now to gain Duchies. And, of course, it can trash incoming $0-cost junk like a Watchtower