I guess its obvious so I cant claim this as "invention" but still I think its good to post it here.
Self modifying spells in any form is a true beauty of Hex Casting. This one is simple but so comfortable to use. Just use your Scribe's Reflection+Hermes' Gambit device on this list and voilà
Don't forget to replace green lines with 8 (Its saved as number for tweaking the spell and represent which position gets overwritten)
Red line must be overwritten with whatever this spell wont be broken with. Use any vector.
Also don't froget that Flay Mind is generated per world!
Happy hunting those pesky allays or villagers!