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that was around 10 years ago

This card showcases Rayquaza's Shiny form, a rare sight to behold and a prized possession for any collector

Magic The Gathering Card Database - MTG Card Prices & Collection Tracker

Key to this of course is its flash keyword, which much like Howlpack Resurgence , allows you to skip turns and prompt transformations whilst still getting threats onto the battlefield with the untapped mana at your disposal

On the private market side, we have apps like Whatnot with no publicly available sold data or again, the Facebook groups/marketplace, Instagram, etc

Will give it a go at some stage though, thanks for the idea