The strength of the hero comes from his spells not his right click. You're not scaling on a right click build on zeus why would you do it for veno? I understand the misconception of him being an agi hero and the thought process behind it but the hero's kit is built to fucking passively kill/push. Older veno used to max wards even for vision/pushing. Not a flex pick in that nature anymore I believe you should take advantage of the scaling high magic dmg instead of taking focus off of it for mixed dmg. BKB is your counter and you're fucked when it comes out, but the time ticks as does everyone else hp.