How about Lens -> Dagon? Lens is obviously a good starting item, with sustain and nice boost to Fire/Malice. Then since you already have Lens you get a boosted Dagon. Nice in sustained fights where enemies have a hard time killing you and slowly get whittled down to 1shot territory. Nice in TP ganks to burst quickly with no chance of escape. What's not to like? Could follow up with Octarine or Veil.