@Neonivek
That is so VERY incorrect.
1. Incarnates DO have attributes. This is way peace of mind+encourage is an IMMENSE damage boost for them. With those two buffs they reach about 35-40 str/fin/int at mid-late game.
2. Their BASE damage scales very well, but no more than other skills, problem is not here.
3. They have infusions, for +25% and +25% damage multipliers. Consider that no normal builds get those.
4. They get an ENORMOUS multiplier out of the blue. (easily 200% in the end)

I get the impression you havent had a summoner team-mate who kept pushing your fire wizard further and further into redundancy with the sheer amount of damage it can dish out with the VERY same skills you get. (eg My fireball does at 50 int and 18 pyro about half of the incarnates fully buffed fireball)

I invite you to demonstrate how self cast can compete with that, because, frankly, that huge multiplier looks VERY out of place.