Why is it impossible to get a specific champion in one for all?

I've been spamming one for all for three days, getting roughly twenty games per day. All I want to to play Orianna. I've tried begging, tried being silent, tried being nice, tried queueing with a friend. Nothing has worked. In sixty games not one orianna. JUST LET ME PLAY HER ONCE PLEASE!!!!!!!!!!!!{{champion:61}} {{champion:61}} {{champion:61}} {{champion:61}} {{champion:61}}
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