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Creepiness aside, he seems like a cool recursive attacker who will continue to harass your opponents using the Armour of Shrieking Souls as long as you can make sure that their creatures keep leaving the battlefield

Ghostly Flicker commonly does so

"Starving Venom Fusion Dragon" and its upgraded counterparts ("Greedy Venom Fusion Dragon", "Starving Venom Predapower Fusion Dragon", "Starving Venom Fusion Dragon, Four Heavenly Dragons" and "Starving Venom Wing Dragon") have various powerful effects that range from negating effects, altering their own ATK, changing an opponent's monster's ATK to 0, and destroying monsters upon their destruction

Considering that Eternatus does not have many ways to accelerate energies, it might be a problem