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While Mew is another old franchise-favorite, this Gold Shiny Mew is a new card introduced in the Celebrations expansion rather than a reprint

Likely because it holds one of the most valuable Eeveelution cards of all time (the third most valuable, in fact): Moonbreon

These will usually be cards like Ashnods Altar, Phyrexian Altar, Zulaport Cutthroat, Blood Artist, and Cruel Celebrant

Venser is particularly good in that he is utility bounce that can hit lands as well as other permanent types

negate the attack, then Special Summon, from your Extra Deck, 1 "Number C" monster with the same number in its name as that "Number" monster you control, by using it as the Xyz Material

Throughout the game, players can evolve their Pokmon and replace them with more powerful iterations, as long as they draw the right cards