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To me, it feels almost like a fixed Marionette Master / Grim Hireling hybrid

In the same scenario, if you have a Detention Sphere and a Jace, Architect of Thought, you would have a difficult decision to make about whether to spend your next turn answering the Zombie or playing a contested planeswalker, whereas with Heros Downfall you can harness a tempo advantage by killing the Lifebane Zombie, untapping, and playing Jace to safely draw cards on an open board

Jafar's taken over

It has some fantastic synergies designed to take advantage of all the Hero cards in the deck

Included with Illumineers Quest: Deep Trouble

However, it also has Delve