Is Double Morellonomicon Viable on Lux?
It's quite cost-efficient, and it allows you to get to 40/45% CDR quickly. Also, with just 100% mana regen I go oom often, but with 200% I can spam my low-cooldown spells comfortably. The only thing you miss out on is the already mediocre passive grevious wounds.
While this all sounds nice to me, literally no one builds it. Why is that? Is there some horrible downfall to this buildpath that I'm oblivious to?

? Reason: You don't get the unique passive twice.
instead of a second of the same item.