The Undying Farming Top Laner

A lot of top laners have built in sustain, but what about a champion built entirely around it's lifesteal?

Passive: Autoattacking will increase the healing effect of all lifesteal for a few seconds, this effect will stack a few times.

Q: Augment your next auto attack to deal AOE physical damage (scaling with AD) around the target hit, this spell is effected by lifesteal. The target attacked will be marked for the next few seconds and attacking them again will continue giving AOE damage.

W: For a few seconds gain bonus attack speed, scales with AD.

E: After a short channel, Flash to the other side of a nearby target enemy or monster and slow them for a few seconds.

R: For a few seconds, all allied damage around you, including damage done by allied towers and minions, heals you for a percentage of that damage.

This champion would be very vulnerable to Grevious Wounds. as well as attack speed slows and armors. Along with this they are based off constantly killing their lane, thus being relatively risky in that they need to push out their lanes to remain topped off.