Summoner icons limited availability, how to tell?

I was wondering if there was a way to see if a icon would be permanently availble or not? for example you cant get the valentine lucian icon anymore, but you can buy the dark star thresh.

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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