Link C2 will make sure you get Parties. Sorc 1 is fine as you’re a melee Mage anyways. So your Temple Shooter will always be in some sort of position to shoot. (Making C2 a little bit less needed). Thaum will give you the power to Transpose meaning you could go full INT, then Transpose, Levitate, Blood Sucking, Blood Curse. Which would do some pretty huge damage, but a lot of cooldowns, again however Sorc C1 would be just fine for this.
My pref. with your build would probably be Linker C2.
Edit: Correction~