Getting Midas Magic in Skyrim on Xbox: Impossible (It's a Mod)
You cannot get Midas Magic on Xbox. Period.
Why
Midas Magic is a mod (specifically, a popular spell pack by modder Midas for the PC version) that adds dozens of new spells, alters gold mechanics, and modifies gameplay systems.
Xbox 360 / Xbox One / Series X|S versions of Skyrim do not support external mods. Mod support exists only on PC (Steam Workshop, Nexus, Vortex/MO2) and PlayStation 4/5 (via Bethesda.net / Creation Club, with strict limits: no external assets, script restrictions).
Legit Gold-Making Methods on Xbox (No Mods Needed)
Loot & Sell: Clear dungeons, sell everything (weapons, armor, gems, ingredients). Use Merchant perk (Speech tree) to sell any item to any vendor.