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The main reason is the extreme similarities the card has with Cranial Plating and All That Glitters, two other banned cards that also buff creatures based on artifacts on the field

The regular Sylveon card benefits from this since its damage output depends on having more Eeveelutions in play

Adi2000 sneaker, a Dark Magician adidas special version TCG card, an Exodia the Forbidden One hangtag, and an assortment of Yu-Gi-Oh

You can also just ignore a card like Torment of Hailfire entirely because the penalty for not sacrificing or discarding things doesnt hurt you at all

if you have no Pokmon on the field at all, you lose