Like most Pokmon cards, the value of Chinchou depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (HSUnleashed)
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Here is every Pokmon V card included in the SIlver Tempest set: Serperior V (Ultra Rare) Chesnaught V (Ultra Rare) Reshiram V (Ultra Rare) Alolan Vulpix V (Ultra Rare) Omastar V (Ultra Rare) Lugia V (Ultra Rare) Regieleki V (Ultra Rare) Unown V (Ultra Rare) Magearna V (Ultra Rare) Mawile V (Ultra Rare) Hisuian Arcanine V (Ultra Rare) Ursaluna V (Ultra Rare) Regidrago V (Ultra Rare) Skuntank V (Ultra Rare) Ho-Oh V (Ultra Rare) Of these cards, many have come from the Paradigm Trigger set
I don't think this card will be quite as popular in other formats as Bitterblossom is, so it should be a good budget option for the foreseeable future
Necron Dynasties - Universes Beyond: Warhammer 40K This mono-black Warhammer deck costs a pretty penny these days, with its Commander, Szarekh, able to mill cards to put more creatures into your hand
Of course, there are guidelines to be adhered to, but those things are stated pretty clearly at the beginning of the project