Crayne: Fractured Empire is a cool 1-6 player deckbuilder/card battler from an Aussie Indie designer that I picked up a few years back at PAX AUS. It’s since received an expansion and has more coming - currently the designer is running a 30% off sale on his webstore between now and the 18th, so a bundle of both the base and expansion will run around $70 before shipping using the code Empire
If you’ve played Eternal: Chronicles of the Throne it’s probably closest to that, if not I’d describe it as a pseudo MtG style deck builder in a single box, probably its coolest mechanic is the way cards in your discard pile give you a discount on cards of the same faction in the market, so that 7 cost card can come down to 3 really quickly if you lean in, but then you run the risk of overspecialising!
It sounds interesting, but still looks expensive when Star Realms is only $23.