When Harbringer of the Blighted is returned to your hand with Cheat Death it does not summon any minions. Should be easy to reproduce since it has happened every time Cheat Death has triggered on the Harbringer.
Harbinger of the Blighted says “whenever this enters your hand from the battlefield”.
Cheat Death says “when a friendly minion dies, return it to your hand”.
The key word here is “dies”.
Dead minions aren’t on the battlefield – they’re in the graveyard.
So the minion did not enter your hand from the battlefield.
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Fair enough. I assumed it was an implied “it is instead returned to your hand” on the cheat death. Though in that case maybe a better wording of cheat death would be “add a copy of it to your hand” since returning minions from the graveyard doesn’t make too much sense given that they remain there after the return.
But either way, I have my answer.