Narek Papoyan wrote a 28-track medieval score for a roguelike deckbuilder and it goes way harder than it needs to. The Royal Writ has this Act I Main Theme that sets up a whole adventuring mood before "Borerdo Forest" drops you into something folksy and rhythmic.
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"Howling Groove" lives up to its name with this rolling energy that makes shuffling through cards feel genuinely exciting. The shift into Act II is so good. "The Blue Seas" opens things up completely, and "The King's Castle" brings this weight that makes the endgame feel appropriately massive.
If you need proof that indie deckbuilders can have soundtracks worth listening to outside the game, start here.