all shadow pokemon cards Rider Calyrex V 172/198 Pokémon card from Chilling Reign for sale at best price Psychic / 210 / Basic Attack 1 Shadow Lugia (Nintendo World promo)

Its best use is in decks that care about creature power like a Ghalta, Primal Hunger EDH deck or together with cards like The Great Henge

The standard Double Rare version currently trades for around $9

The next expansion will continue to trend of releasing new Mega Evolution Pokemon EX cards, and a trailer that has been released alongside the announcement shows that Grass-type Teal Mask Ogerpon EX, Psychic-type Mega Gardevoir EX, and Steel-type Mega Mawile EX will be among the cards included in the upcoming expansion

Perhaps that's because, despite the massive damage potential, they're simply too slow to make use of that massive attack

There are multiple nice resources regarding misprints on the web