Is Shamrock Malphite rare?

I got it in Hextech and it's a oretty terrible skin. However, I'm not entirely sure if it's rare or not. Worth upgrading?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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