Spell Blending

[Quandary]

I just don´t see the need for this. They can use UMD. This ability just means nobody takes the Magus list seriously at high levels, because any Magus worth their snot would take Wizard spells if they are advantageous.

Also, the ¨He adds this spell to his spellbook and list of magus spells known¨ is sort of wierd wording. I`m GUESSING that means the spell now counts as a magus spell for other class abilities, but why not just state that directly and not use the seemingly repetitive ´spellbook and magus spells known´ phrasing...?

[JRutterbush]

Considering you only get to choose one or two spells, you're still going to be mostly limited to Magus spell, unless you wanna use ALL of your Arcana on this. Which has problems of its own, obviously.
So, yeah... not a big problem, here.