Interesting concept, I feel it might've have been nicer if it had like a combination list on the side of the screen or something, so the puzzle would be trying to work out which spells to go for instead of what cards make spells.
Managed to beat the game, but by entirely relying on buying the 10 cost stack and selling anything that didn't sound like a castable spell. Probably not the intended win route :v.
That said, it would have been nice to know which ones were castable, I had a lot of cards lost to the void that is the tomb where they aren't cast and I can't pick them back up.
Good work team!