Eternal Might reinvented the Zombie tribe for the Aetherdrift setting, moving away from slow attrition to high-velocity aggro
A fun little sidequest of a Commander, but not quite best in class
The creatures are big and synergize with artifacts and the graveyard, like Gurmag Angler, Myr Enforcer, and Kenku Artificer
In theory, at least, Disturbed Spirits is the perfect deck to harness its power since the front side of our disturb cards are Spirits (growing the Spirits that Hallowed Haunting makes), while the backside of our disturb cards are enchantments to trigger Hallowed Haunting
I now consider it an honorary piece of power along with Tolarian Academy, Mana Drain and the like), it was good in every deck and oppressively good in this archetype specifically
Much like the main series, Pokmon come with their own list of elemental strengths and weaknesses, and can even evolve if you draw the required card