Homebrew Class The Grand magus

So i created this class based on the inspiration of Rubick from dota and sylas. I wanted to create something of a melee sorc fighter that would use enemy spells against them. I played it to lvl 14 and it did feel a bit strong but that was slightly due to some multi class shenanigans. Would love to hear feed back and feel free to use it in your own game

When a caster is 9th level, that does not equate to getting 9th level spells. Is this a subclass for Sorcerer? Because it looks like one. 

Spell Steal in general is way too strong for that little effort, and being able to permanently learn them later is also very strong. 

Lvl 4 and having Mage Armor convert to 18+Dex is probably the most overpowered thing on here, and that's saying a lot because everything's pretty OP. 

Astral Magus is all over the place as a feature. Wish already allows you to rewrite the fabric of reality - what 10th level spell could you possibly create that would be more powerful/more beneficial than that?

i cant see the class

Quote from VanZoeren >>

When a caster is 9th level, that does not equate to getting 9th level spells. Is this a subclass for Sorcerer? Because it looks like one. 

Spell Steal in general is way too strong for that little effort, and being able to permanently learn them later is also very strong. 

Lvl 4 and having Mage Armor convert to 18+Dex is probably the most overpowered thing on here, and that's saying a lot because everything's pretty OP. 

Astral Magus is all over the place as a feature. Wish already allows you to rewrite the fabric of reality - what 10th level spell could you possibly create that would be more powerful/more beneficial than that?

 Sterling Vermin, the creator of the Pugilist and upcoming Magus class. Has a Thaumaturge class the get access to 10th level spells at 20th level. You have to use a class feature and 9th level spell slot