Hope your name's not in the drawing for the Hunger Games…
It's called RNG
You should do some more R&D. I imagine you're Lack toes and tolerant.
There's 18 champs. You opened 12 crystals. You were guaranteed to not pull at least 6 of those 18 champs. You've only named 4. Congrats on hitting the odds I guess?
Unlike bugs, and a ton of BS on this game, it's all RNG, and there's nothing you can do about it, but open more crystals.