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The Pixelcoin was obtainable in Season 25: "Pixel Arcade" by being in the top 2% when the season ended.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Pixelcoin's current MU count is at ~386, which is similar to most other uncommon items (such as Flaming or Hatch Voids), and even lower than some uncommon items (such as EXP1 which is at ~445), despite Pixelcoin being at common.