From level 50 to up there isn't anymore any str items which gives anythig else than str. Also with rift you lose mana, but regen is enough high to keep it mostly full all the time if you won't use mana shield.
Also you can try to maximize your amount of int by doing respec. Put str, amount of you need to equip 45 items, choose ones which give str(Osiris), equip full set of Osiris and then equip rift( you can equip it even your base stats isn't enough, item boost your str enough high to equip rift items ). You can save 20 points and can use them to int.
And yeah you are right, higher int value makes your skill damage at Mage higher.
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