It's not lethal. Main reason is because we need to start the chain w/ a circle if we dont use nova.
maximum we could push this turn i think is pyro, velens on lightspawn, circle, circle, nova. I think. thats 3 from the nova, then the lightspawn gets buffed +2, +8, +8, +4. So I think we can push 28, leaving us 8 off lethal.