Shifters first item scales well with cu chu, but I also recommend building mystical mail first for some extra lane pressure. Also you can replace it with genji's if their is magical dmg in your lane.
Your goal as Cu Chu is to be a nightmare for the enemy backline to deal with. If you dive the backline and your team capitalizes you will win many team fights. Unfortunately if the enemy support is smart you might not get away with diving the backline as much as you would like.
We only build Genji's if there is magical dmg in our lane.
If there is a lot of life steal on the other team we trade this out.
leviathan scales well with cu chu, if you wanna survive even longer than I recommend getting this item online early.
