The real keystone everyone should be worry about.

Kleptomancy. It does not give bonus damage like dark harvest. But the ability to generate gold from harassing someone is just wrong (morally speaking xD) and figuratively. +5 gold on ur next two attack or get an item. The sustain that this keystone gives is amazing if u pair it up with biscuits as well.

With dark harvest u have to 50% health to proc. But Lucian ez nasus gp renek can all proc it very easily