I always buy Trackers Knife
I get sick of not being able to get my laners to ward their lanes. So I as their jungler have decided that I can at least keep 2 vision and a pink up near one of my laners so that my precious gp or yasuo that started off 2/0 then is to stupid to keep some wards up so that the enemy jungler cant gank whenever they use their advantage over their opponent. I might be able to pull an extra flash or kill with a blue or red smite but I dont think I can for sure so I will get those extra few wards out every few minutes and pray someone looks at their mini map more then once every minute.
