Help! Having hard time what 7* champs are the best to rank up

I'm not sure what the best champs to rank up is. I can bring 1 to r3 And 2 to r2 and I play aot of battlegrounds.

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https://forums.playcontestofchampions.com/en/discussion/409044/help-having-hard-time-what-7-champs-are-the-best-to-rank-up

Serpent, jean grey and okoye

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