When you sacrifice it to Skirk Prospector, it returns with a -1/-1 counter, but this cancels out against the +1/+1 counter provided by Metallic Mimic or First Day of Class
Experience reprints from Magic's history in the art and story of Final Fantasy Commander Decks
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It quickly became evident that you can build Atraxa, Praetors Voice around any type of counter, including poison and planeswalker loyalty counters, making her one of the more powerful legendary creatures in the game
Its generally better to buy individual booster boxes over cases
Cast it with extra mana to make it huge, and you can remove counters to draw cards and create robot tokens and fuel both your board presence and card advantage