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Proliferate Decks - In decks like Five Color Planeswalkers with a bunch of proliferating to raise the loyalty counter count, this can be used as a win con with just one or two hits turning into wins

Despite its limited availability and exclusivity, this card isn't the most expensive HGSS promo, thanks to a more valuable option from one of Kanto's most popular Pokemon

As speculated by TCGplayer, there could be several factors contributing to the card's massive price point, most obviously the fact that's from the recent Twilight Masquerade set which is still relatively new