Finally have 10 Gemstones

I finally have 10 Gemstones now my question is, how often are the Mythic skins released? I know Hextech Kog'Maw was just released within the last 2 weeks but I'm debating whether or not to use my gems now or wait to see what the new skin will be in however many weeks/months.... Anyone have any information about the Mythic skin releases. Or should if i were to use my Gemstones now which skin do you guys think is the best out of the 6 available.... {{sticker:darius-angry}} {{sticker:vayne-pose}}
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