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My guess is that Amulet of Safekeeping is R&Ds attempt to try and answer the question of how to ensure that Modern players can sideboard against multiple strategies at once so that your progression though a large Modern tournament is less matchup dependent

Modern, Legacy) and the popular 4-player Commander variant

A League Leader may assist in organizing the league, while a League Owner is the one officially in charge of the league, reporting to the Organized Play program any results and/or problems every seven weeks

Features exclusive artwork of The Crystals Chosen by Kotetsu Kinoshita

This mechanic means that as your creatures die off, you can gradually move them onto the "second battlefield" that is Afterlife over the course of the game