Morphling + Wraith King

Why this works

Using Morph on an allied Wraith King gives Morphling a temporary second life via Reincarnation. This allows him to be the frontline aggressor for a short period, soaking up attention and spells that would otherwise threaten his real health pool. He can commit to a fight, die in the copied form, and then reposition or continue fighting with his own spells. The extra stun from a copied Wraithfire Blast also gives him more lockdown to secure a kill before he has to escape, making him a more versatile threat for a short duration.

The general idea is for Wraith King to be the durable anchor while Morphling leverages the copied form for aggressive plays or to escape ganks. When it works, Morphling can survive a burst attempt by turning into Wraith King, effectively wasting the enemy's big cooldowns on a temporary body. However, this play is predictable. Smart opponents will try to wait out the Morph duration or simply switch targets. The strategy also depends heavily on both heroes being near each other, and if Wraith King dies first, Morphling loses his best safety net.