While not a true bug, this creates an experience frustrating enough that it needs correcting like any other bug.
I have an arena run that just got completely bricked due to horrid RNG. I started with a Druid using Hamuul Runetotem with the imbue ability if all spells in the deck are Nature. Ok, fine, right? Just don’t choose other spells. Nope! On the 13th card, I was presented with 3 Arcane spells. Zero choice, I MUST choose a spell that isn’t Nature. That is RNG at its worst. Provide a limited number of choice rerolls so we at least have the opportunity to avoid this instead of it being a forced bricking, Blizz, please.