why is there so much magic restriction in this game?? low end spells anything over 100 magnitude = impossible to cast

You can still enchant with invisibility with 100% chameleon which is basically the same thing minus the fact it wears off on interaction. But you'll need a lot of items to get to 100%

The fewest number of items you'll need (assuming you'll only use enchantments, and not custom spells, ect) to reach 100% is 4 items, although you can get 95% with only 3 items. Transcendent Sigil stones yield 30%, some random enchanted loot also yield 30%, and the Ring of Khajiiti yields 35%.