The simple counter to this is your opponent not challenging
That is a valid way to go about it if you think the seller is trustworthy enough
bulbapedia.bulbagarden.net Good Manners (Gym Heroes 111) - Bulbapedia, the community-driven Pokmon
23.2 GST and amounts payable to the Company: (a) All amounts owing by the Seller to the Company (including, without limitation, the Seller's Commission, the Offer Fee, the Insurance Fee, and Expenses) under this agreement do not include GST
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Its the only prism (not foil/holo) in the entire Hyper Battle collection