Fewer decks have access to consistent ways to impede this combo, and those that do still have a full table of opponents to interact with otherwise
I'm just assessing what I've seen so far by the metric I've outlined here
Legendary Creature God At the beginning of your upkeep, each opponent loses X life and you scry X, where X is the number of Zombies you control
This plays especially well with merfolk lords like Lord of Atlantis and Master of the Pearl Trident, where simply having more creatures in play turns directly into extra damage
You can only use this effect of "Crimson Star Supernova Dragon" once per turn
Aettir and Priwen Balamb Garden, Airborne Crystallized Serah Diamond Weapon Excalibur II Lunatic Pandora Omega, Heartless Evolution Ring of the Lucii The Darkness Crystal The Earth Crystal The Fire Crystal The Lunar Whale The Masamune The Prima Vista The Regalia The Water Crystal The Wind Crystal Ultima Weapon World Champion, Celestial Weapon