magic the gathering march of the machine booster box Machine: Aftermath: Collector Stamped Signature Art Card replaces Art Card in 10% of boosters MTG - March of the

Anna Stosik: All elements on a character, such as costumes, need to follow guidelines, which are closely connected to the theme of the set

It's best friends with Accursed Marauder and the like, which dump a bunch of counters on Zodiark

Plus I can jam some of the random Equipment I have lying around to get the occasional commander damage kill

Additionally, these 2 cycles function a bit differently from each other

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EDIT: A new and more likely theory has presented itself for Grey stamps in this post by @pokemonrevolution