Xaltis
Smash Hero
So Sona with Sorcerer Boots + Tear + Rylas + Rabadon's + Lych Bane and 20 stack Mejais.
Then use Q for your 3rd spell to activate power chord and hit a turret. It takes half the turrets HP in 1 hit. = D
Then use Q for your 3rd spell to activate power chord and hit a turret. It takes half the turrets HP in 1 hit. = D