If Blizzard were to refresh another older raid tier with new difficulties and recolors, which one would you pick?

Collectors bounty has its hooks in me and my transmit collection is bigger than ever. I keep looking back at the older sets and wishing they had the same Heroic and Mythic variations. If I could have any of them redone Tier 4 or 5 are strong contenders for me.

Image note: upscale was done with an ai tool but this very obviously isn’t my original texture or for a commercial purpose, just proof of concept. Edits and recoloring done in Paint.net.