I thought of buffing it with the better build-up and more mana regen^^.

Veil seems just fine, where have you observed that it needs a nerf?

Since 7.20 it doesn't feels right that Veil of Discord gives so much int, even though the components don't have that much. 


What would you guys say if instead of the recipe Veil of Discord requires a Sage's Mask and a Robe of the Magi. This would increase the cost by 75 gold. The int which the item gives could be reduced by ~5 and mana regen of ~1 could be added, giving Veil buyers more sustain for farming/fighting.


Summary:

Components: Helm of Iron Will; Crown; Sage's Mask; Robe of the Magi

Stats: 6 Agi/Str/Armor/health-regen; 10 Int; 1 mana-regen

Changing the build up of Veil of Discord slightly.