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"Number C" monsters have powerful effects, though this is balanced out by their requirements - needing 1000 or less Life Points for the "Number C" monsters that have the same Rank as their "Number" counterparts, or requiring specific monsters to be attached to them as Overlay Units (or in the Graveyard in the case of "Number C101" and "Number C103") for Ranked-Up "Number C" monsters

Fuwalos can also make Primus not worth summoning

There have been stories about off center cards above these thresholds getting PSA 10s but most of those were graded before 2022 - after that PSA raised their centering standards more inline with the competition (BGS/CGC)

Its unparalleled scarcity, cultural significance and high-profile visibility solidify the Pikachu Illustrator as a landmark artefact in trading cards