I’m already finding that just the little boost to defense and health along with the attack boosts has made a difference.
I’m going to keep going the attack route, with some bonuses to defense/health baked in along the way on those paths, and keep using a 4* crit troop with him that’s currently at level 12 with a 16% attack, 19% defense, and 6% health boost.
And while I use him for the mana freeze, the DoT does also make a huge difference in winning Raids, especially as the amount slowly creeps up.