when do i get the tutorial champs for free

So I'm lvl 11 and have done all the start quests until get mastery lvl 3 on a champ. I only have 1 start champ u get at the beginning (darius). I can't play draft as I don't have enough champs which is why I need the free ones u get such as mf and lux. I haven't been offered them yet through quests or game play so when or how do I get ghem
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