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The Clickbait was obtainable in Season 5: "Let the Memes Begin" by reaching level 3.
Clickbait is an extremely rare spoiler to spot in trading, with it having a relatively low MU count of ~64 and only 3.3K copies being made (which is similar to that of Tikitorch, another extremely rare item).
Supply is widely distributed — no single holder owns enough to register as a hoarder.