It turns Thrasios' ability into pay 4, draw 2
Those decks, shockingly, are full of artifacts, which means Mox Opal is usually online when you need it to be
Links: TCGPlayer, Amazon, Best Buy, Walmart, Target Black Bolt Elite Trainer Box $49.99 White Flare Elite Trainer Box $49.99 Black Bolt Binder Collection $31.99 White Flare Binder Collection $47.99 Unova Poster Collection $21.99 Unova Mini Tin $16 Aug
Part of this is due to art and other concerns, but a large portion of the value comes from the fact that owning a first-edition foil of a valuable card is just very cool

Strengths for high-end: Massive buyer pool means maximum exposure Auction format can drive competitive bidding above market price Best Offer allows negotiation on Buy It Now listings Extensive buyer base of sports card crossover collectors who spend big Authentication service for cards over $500 (eBay partners with CGC for this) Limitations for high-end: Chargeback risk is real and eBay's seller protection has gaps for high-value items 13% fees on a $5,000 card = $650, which is painful Buyer-friendly dispute system can be exploited Listing quality varies wildly you're competing against professional dealers and random sellers Critical eBay tips for high-end: Always ship with signature confirmation (required by eBay for items over $750, but do it for anything over $500) Use eBay's promoted listings to get more visibility 2-3% of the sale is worth it if it attracts more bidders Document everything: photograph the card, the packaging process, the shipping label

Decidueye Golisopod is another option, but you already have enough Golisopod-GX and Decidueye-GX decks in the gauntlet as is