varus' passive is kind of boring.
It also sucks, so im hoping it gets changed to fit his theme of long range poke/initiator. Maybe give him ms boost kind of like furor when he hits someone. Or move his w to be his passive since its literally a passive ability and give him a new w.
Heres my idea for a new w: tendril grapple: varus fire a tendril of corruption. If it hits a champion it does damage and applies a stack of corruption. If it hits terrain it drags him to that location (much like nautilus q). Probably not as long range tho. This would probably be busted but i think it would make his kit more fun, cuz as is he only has 3 abilities.