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There are three cards which grant Retrace to spells which don't have it built in - Deeproot Historian, Six, and Wrenn and Six Because of Kindred Sorceries existing from back in the day, Deeproot Historian actually can make some Kindred spells have Retrace in addition to Merfolk and Druid permanents

Understanding rarity and production is a huge step, but it's just one piece of the puzzle

In the past, the main concern was random, expensive, old Reserved List cards, which are comparatively easy to counterfeit

Allowing for filtering on counterspells means you can proactively dig for other answers or threats as needed while still playing a reactive game

Theres a couple of other variants on this effect like Not Dead After All and Undying Evil, but Malakir Rebirth is the best thanks to the flexibility of MDFCs

Evergreen Foils - Pre-Modern Foil The Standard Foil For Years First released into packs during Urzas Legacy, this type of foil would last all the way up to Scourge