who to rank up against sunspot

Avi0612

my incenerate immune champs are: 5* r1 volture
4* r4 red hulk awakened
4* r2 havok and mephisto, both are unawakened but i have 4* generic awakening gem.
my goal is to get 4* to r5 or 5* to r3 for this purpose.
thanks.

unknown

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