rainbow rare pokemon cards gx Sun and Moon Burning Shadows Hyper Necrozma #153 Ability — Trade Once during your turn (before your attack) The 10 rarest Rainbow cards

If you're looking to hunt any of these rare cards down, your best bet is picking up a Collector Booster set from Amazon right now, but be prepared to pay around $480 for just 12 packs

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You wont see much traction on TCGPlayer without a full shop on the site, but anyone can list goods on eBay

Dominaria United Jumpstart Boosters each contain: 1 Theme card that describes the theme of the Jumpstart Booster 20 Total playable cards 2 Rare cardsone random rare or mythic rare from the main set within the theme's mana color and one rare that is designed for Jumpstart Boosters 2 Traditional foil lands 5 Non-foil lands 1 Non-foil full-art stained-glass basic land The five new rares designed for Dominaria United Jumpstart Boosters can also be found in Set Boosters, in both foil and nonfoil, as well as in an extended-art version in Collector Boosters

Of course, the fact that you can tune it to the situation somewhat helps as well