Retired Shaman Signature by Winter Blossom
I think choosing affixes is a bad idea and i quite like that some weeks are harder than others.
Incorporating some.kind of in game leaderboard would be good.
Not quite sure how it would work but some titles/toys/pets/mounts would be some welcome rewards.
We get stuff for mythic normal meta, stuff for raiding meta. PvP gets top season so maybe mythic + could work like that too