Slay the Spire: I don’t just think it’s the best deck building roguelike, I think it’s the quintessential deck building roguelike. It’s such a complete exploration of the design space of the genre in terms of the options it gives the player to build their deck and the challenges it puts those decks up against. Not that there aren’t any other fun games in this genre, but they all still feel like STS, but worse and with a gimmick that doesn’t add much.
-Will edit with more in a bit.