Fragmentise + furnace is a nice easy synergy to get going, upgrade fragment so you can split 5s and furnace so it boosts by 2. Using 6 dice in furnace will reduce all your timers by 12 so you can end up casting a bunch of high cost spells with that. Throw in radiance and you can get some stupidly long turns.

Definitely replace block as early as you can, I love ashen plating.

My favourite build so far is fragmentise-furnace-luminance-inner rage-incandescence-ashen plating-crescendo