Can a mythic PC craft a magic item with mythic spell?
For example, could a mythic PC craft the mythic version of the ring of invisibility i.e. the ring of mythic augmented invisibility after that the mythic PC has transformed the ring in a minor artifact with the universal path legendary item?
I would say yes, but only if you have the Mythic Crafter feat. Also, if you're not the GM, check with them to make sure they're okay with that power. An at-will, super-capable invisibility is a game-changing effect, and definitely not something that should be done without explicit permission.