ARAM is not truly random?
I have Kalista, and I've been given MF, Sivir, caitlyn, and tons of other champions many times in this game mode.
However what I've just noticed is that I don't play Kalista, or haven't played her in at least 6 months. I also haven't ever gotten her in ARAM since a very long time ago.
I'm actually a bit suspicious that this isn't truly random picks.