New Arena and Spell choice

Whenever the new arena mode comes out, It would be interesting to not go in blindly into a match with fixed spells, but instead allow us to chose our spells right before the match starts (only once)

Currently so many matchups are dependant on each player playing the correct spell in that specific matchup, I think any kind of arena mode would benefit from allowing each player to select their spells according to their matchup.

For example :
Queuing into an arena match > display of both players name and their class, 15 seconds of preparation (during which we can chose our spells), and match starts.

I think being stuck in a specific spell build blindly would take away a lot of the enjoyment of diversity of builds and counter potential
curious to hear ppl opinions on this