Kai'Sa purchasable but temporarily disabled, why?

Can buy her but whenever I go into a custom game to try her out it just says she's temporarily disabled, yet there is no yellow/green or red exclamation mark to say if there's a bug going on with her or anything like that. Edit: Could it have something to do with different time zones?
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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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