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The Ankylosaurus was obtainable in Season 33: "Jurassic" by reaching level 7.
Ankylosaurus being the most recent L7 reward from the newest season, it has been doing quite alright. It's not particularly looked for by much traders, however it can get 500K items with relative ease, such as Rollx, Ghost Catcher or Overdrive.
Supply is widely distributed — no single holder owns enough to register as a hoarder.