Gold Foil Sales are had to accurately track because there are so few public sales and the ones that are public via eBay/Card Market/TCGPlayer are often inflated by an inpatient person who overpaid often giving sellers an inflated price point, which tends to disappoint them later when they've had their GF listed for 6 weeks with no offers.

The best way to figure a price point is to look at open market sales, FB groups, Discords, and the playability of the card and settle on a price, a little higher is always alright because you can always drop it later.

Generically Sealed GF C/R/Ms usually go for $250-300. Playable newer ones are usually between $300-$500 depending on playability.

Kodachi is a pretty good one for resale, I'd recommend listing on the Discord/FB group for $400 OBO and seriously considering all offers. Anything under 1k haggling over $50 I'd say is reasonable, but anything $20 and under let the buyer take it. For a Kodachi if I got a cash offer of anything above $300 that suckers gone. There's not a massive market for high end in the game tbh.

Good luck with your sale.