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The Gym Leader Challenge is a casual format where you and your opponent master a single type of Pokemon using an extended list of legal cards beyond the standard format

And, once again, its rarity and history make the card decently valuable as far as MTG cards go

Sources: TCG Player (Base Set Mewtwo, First Edition Rocket's Mewtwo, Mew & Mewtwo GX, Mewtwo ex, Mewtwo Gold Star, Rocket's Mewtwo ex, Shining Mewtwo, Mewtwo e-Card, Rocket's Mewtwo [Winner], Mewtwo [XY Evolutions Staff Prerelease]), PriceCharting (Base Set 1st Edition Shadowless Holo Mewtwo, Mewtwo Gold Star)

The edges are crisp and show no wear whatsoever