I could take the time and break it all down, but I would rather you just try it (standard game) and see what you think... Can switch out last item for BV, but I think the extra health/slow is enough once you get good, plus the slow is nice. Use flash and Ghost to escape if you mess up!

210 Base Damage Per Hit
142 Magic Damage Per Hit (Based on 2000HP Target)
352 Base Damage Per Hit Total
15% Life Steal = +30HP Per Hit
@ 180% Increased Attack Rate Unbuffed (Caustic Spit add's an additional 30% Attack Rate)