Skiesofwonder
Walruses, camels, bears, rabbits, tigers and badgers.
You can change Relics to a separate button in the options,I had the same problem you did until I changed it.
Awesome news. I looked during my last play session, but I didn't see ability to change up + Y. I'll be sure to do this when I boot Shovel Knight up again!
Edit: I see, had to change relic to button first before going to change controls. Didn't see that beforehand. Changed it to ZR, feels great!