I'd rather make a separate post for this next issue - Balance;
From what everyone has said, more or less, Int/Dom is the only problem with this entire setup. However, the simplest way to fix all of this is to not make it "Two Primaries" but rather a "Strengthened Secondary". That way all the restrictions apply for both sides such as Borgs, Rukh Sense, and Legendary Beasts. I think someone suggested this, but I just don't feel like scrolling up right now.
So, simply put, Int/Dom is OP in the proper hands, just not as an idea in and of itself with the Primary/Secondary restrictions applied;
Int Primary - Rukh Sense, Borg, 3rd Magic Type, Defense Restriction, Weak Constitution
Dom Secondary - Beasts, Last Stand, No Legendary Beast, No Extra Magic Type (LB)
Dom Primary - Beasts, Last Stand, Legendary Beast, Extra Magic Type (LB)
Int secondary - No Rukh Sense, No Borg, 3rd Magic Type, Defensive Restriction(?), Regular Constitution
I thinks that's all the pros/cons per combo. If I'm wrong, just say so...obviously. But yeah, keeping the Primary/Secondary restrictions in an Omega/Omega spec combo even makes Int/Dom a "less OP" idea.