SymSupreme is a great champ but has niche uses, CapIW and Domino are 2 of the most well rounded champs in the game in terms of the number of opponents they can dominate. I would rank 5 SymSupreme till you have a few more ranked up champs.
Personally I have a 6* r2 unduped SymSupreme but use 5* r5 CapIW and 5* r5 Domino 10 or 20 times as often as SymSupreme.
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Personally I have a 6* r2 unduped SymSupreme but use 5* r5 CapIW and 5* r5 Domino 10 or 20 times as often as SymSupreme.