Can magic mushrooms grow on hay ?

Like I have grown gourmet mushrooms in hay before and was wondering if I could use hay for magic mushrooms like B+ I have a cake that is on its 3rd flush and if it still shows no signs of contamination I could break it up and put it in there it would be a MASSIVE grow witch would be kinda cool btw I would sterilise it by soaking it in water mixed with ashes I do this for gourmet the ph kills the bacteria