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The Radar rim was obtainable in Season 12: "Bring in the Military" by reaching level 9.
Radar isn't necessarily an easy rim to come by. With it having only 5.7K total copies, and a MU count of around ~100, it puts it in similar rarity to other extremely rare rims such as Frostburn or Centerlock. It's also hoarded with around ~112 copies being in hoarders possession (and potentially even more).
Top 3 holders control
Largest holder · 49% of circulation