As for why the Rapid Strike Urshifu is three times as valuable as the Single Strike Urshifu

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UR Ultra Rare Fairy Archer Ingunar X EARTH Level 6 [ PlantEffect ] ATK 2400 DEF 1200 Cannot attack the turn this card is Special Summoned
SAR is brand-new art, often cinematic, usually featuring the Pokemon in habitat or with a signature trainer at their side
I play them