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This includes people using all foil lands / no other foil cards (marked cards), only foil versions of a couple of key cards in their deck (marked cards), and being able to pick out foil cards on the top of your deck due to feel / warping, even through sleeves (marked cards)
You couldnt sleeve up a new deck for your local game store night or booting up Arena without knowing youd be playing against the Viven Cauldron deck at least three times
Sources: PSA/XY Charizard, PSA/Cosmos Machamp, PSA /Rayquaza VMAX, PWCC/Pokmon Snap Pikachu, PSA/Base Set Squirtle, PWCC/Venusaur Promo, PSA/Mewtwo
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Overall, it's a much more versatile batch of cards than this grab-bag of Hatsune Miku planeswalkers - some are good in Commander, but you also have the Modern card Living End, as well Careful Study, which sees a little bit of Legacy and Pauper play