Across all of my testing with the theme, there are three standout rules to follow for the rest of the deckbuild that gives the Chaos Ritual strategy all it needs to thrive: Every build needs to have at least: 1 non-theme way to get Skull Archfiend of Chaos to the GY without requiring the Normal Summon 1 non-theme way to get 8 Levels of monster(s) to the GY, to banish for your first Ritual Summon, without requiring the Normal Summon 2+ ways to field a Level 7+ Main Deck monster, that doesnt mind being left on board, that you would also like returned to hand
Reading the Card
You can send this face-up card from the field to the GY
[-12]: Exile each nonland permanent your opponents control
There are two different designs for this box: one featuring Leafeon, Umbreon, Jolteon, and Flareon, and the other featuring Sylveon, Espeon, Glaceon, and Vaporeon
This kind of effect is always popular amongst players, and getting to cast such a spell twice--once for free during your upkeep via Rebound - is sure to be a hit