Benefit: When a magus selects this arcana, he must select one spell from the wizard spell list that is of a magus spell level he can cast. He adds this spell to his spellbook and list of magus spells known as a magus spell of its wizard spell level. He can instead select two spells to add in this way, but both must be at least one level lower than the highest-level magus spell he can cast.
Special: A magus can select this magus arcana more than once.
1. As far as I read it you add it to your spells known (and spellbook) so it should work. Never even thought about this before.
2. Again as far as I read it that should work. It's worth noting that you have to make all choices for the feat the first time you cast it every day. This means if you use Paragon Surge to learn CLOUD SHAPE in the morning, and then cast Paragon Surge again in the afternoon you'd have to choose "Extra Arcana: Spell Blending: Cloud Shape" again in the afternoon. It does give you a flexible spell though, so it's not terrible.
There could be some ruling or FAQ somewhere that contradicts this, but going from the wording of the abilities in question that seems right to me.
There could be some ruling or FAQ somewhere that contradicts this, but going from the wording of the abilities in question that seems right to me.The FAQ is precisely that.
Yup, that's what I was saying: "... if you choose cloud-shape in the morning you have to choose cloud shape in the afternoon". You can't use this to cast any spell spontaneously all day, but you can use it to gain a useful spell for that day (think of it like "Wandering Hex" or something similar).
I'm less sure about being able to take Spell-Blending as an Eldritch Scion. Again it looks fine by the wording, but there could be a ruling there that I'm unaware of.