Help choosing 3 more 6* to take to r4

Corndog

Im at 6.2.6 if that helps. I already have Jean and doom at R4. I was thinking yelena and sinister next? Then I don’t know who. Do I wait to see who else I get before choosing a fifth maybe? I should have my first 7* in about a week I think.

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DannyB

sinister can carry you to act 9