STS gift ideas for obsessed boyfriend

Hi Slay the Spire players!!!! :D

It's my boyfriend's birthday in a few months and I'm looking for Slay the Spire inspired gift ideas. He has every version (switch, pc, phone) and I got him the board game for Christmas. Is there anything else game related that you think would make a good gift? Cool merch? Anything in game I could buy him? He loves this game so much but I don't know enough about it😅TIA you guys rock