mewtwo gold pokemon card Star - Holon Phantoms 1999 Gold Mewtwo Pokémon card

Adding 20 cards to your deck seems like a massive drawback that would hamper the consistency of your deck yet Yorion got the ban hammer in several formats, and some Modern decks still tinker with 80 cards, even without the extra creature in their sideboard

Think of cards like the Blastoise WOTC Presentation Galaxy Holo a limited English-print sample or the Snap Pokmon Cards featuring real in-game photos

I wouldn't have an issue if you ran it against me in Pauper Commander since it's a one-of, but your milage may vary

If it was fake, it deserved it. I thought about bringing up the Middle Ages, witchcraft and the swim test, and then mentally closed that can of worms