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The Holo Spoiler was obtainable in Season 31: "Freestyle" by being in the top 2% when the season ended.
Holo's current MU count is at ~1.4K, which is similar to most other common items (such as P-100i or Voxel), and even lower than some common items (such as Radiant Pink which is at ~1.6K), despite Holo being at very common.