Urgot with the infinite W
Why doesn't he get charged per second like Singed Q?

Why doesn't he get charged per second like Singed Q?

Because Urgot's W is doing almost nothing on its own.
His damage comes from his passive, which has a seperated cooldown for every leg. His W is nothing more than a tool to proc his passive, but the skill itself does not provide much since they moved the shield away from it.