What addition should we have for arena to make the game better

What addition should we have for arena to make the game better 22 votes
5* feature arena, only 5* champs eligible. Top milestone gives 5 grand master crystals, rank rewards include feature grand master crystal
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Each buff gives set amount of rewards (gold, ISO, battlechips) and each milestones give shards and fragments).
Top-50 get a full extra catalyst or Ascendant crystal? You've increased the 4-star featured arena to the top 800, and the 4-star basic to a 1-10% bracket (thousands worldwide); but you're still only giving away 50 T4Bs across the world?
And what about putting some T4C shard crystals in the milestone rewards?