ADC Tier List Patch 10.17

Never heard of Sona ADC, definitely does not seem viable unless you're doing the old Lux + Sona funnel strategy.
Sylas ADC? That's also a new one for me, never seen that or heard of it before.
Karthus has also fallen as ADC with his nerfs to his base armor so you might want to bring him down a tier or two.
Otherwise I agree with the tier list, well done.

Sona ADC? that is new to me, what is her build?! I saw a video once of Sona doing Pentakill and I still wonder how can someone get so lucky... But still, Swain is more of an ADC than Sona, the samee can be said about Sylas... Hey how about you update the tiers to include Samira? ;)
Anyways, good luck :>