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The Scythes was obtainable in Season 30: "Darkest Winter" by reaching level 3.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Scythes's current MU count is at ~201, which is similar to most other rare items (such as Skull or Snow Log), and even lower than some rare items (such as Star Wing which is at ~208), despite Scythes being at uncommon.