Read the store description, but basically, mostly different cards from Thronebreaker (more up to date with current multiplayer Gwent, plus a bunch of unique Rogue Mage cards). Rather than a linear narrative, you're doing runs again and again in a semi-randomised way, building a new deck for each run, more like Slay The Spire. It does have a good story, though, but it's less story focused than Thronebreaker.