Lightning infused firewall with dark effigy totem

How viable could a build like that be? A firewall that's lightning infused so it provides bonus fire and lightning damage to all projectiles that passes through it, then the dark effigy totem placed down so it spits millions of projectiles a second through the fire wall?

i think you can give it a try, but it will feel terrible having to do that much setup for the combo to do anything.