Yeah it's cool in theory, but he runs into the same issue as a lot of other potentially interesting heroes to run: Where do you lane him?
Mid? Not impossible after bottle-crow nerf. You'd need to win your other lanes. He's not that great at anything middle lane except for making people run back, forcing them to miss last hits. He works well against Shadow Fiend and virtually every melee hero, but a lot of heroes shit on him.
Safe lane farm? No way. If you run him as a farming (chain-pulling) support hero, there's no way he's going to get that Aghanim's Scepter in any reasonable time frame.
Off lane farm? Needs +1 to even stand under tower.