yu gi oh structure deck fire kings King Sky Burn SR14-EN025 Deck: Fire Yu-Gi-Oh 1st Edition MP Yu-Gi-Oh: Fire Kings Structure Deck

They actually arent that uncommon in the earliest days of the TCG, but pretty much stop appearing circa the Neo era

Ultra Prism released in 2018 as part of the GX era, known for Rainbow Rares, full-art trainers, and the Hidden Fates / Shining Legends shiny vault chase

We have to figure out where it came from

If Gogo copies a legendary creature, Gogo will also be legendary, but because its name remains Gogo, Mysterious Mime, the "legend rule" won't cause either of them to be put into the graveyard

The Professor intends to merge them back into his daughter and reunite the four dimensions as the Original Dimension using his Arc-V Reactor