Necro or Crucible for Valiant
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It seems like the Crucible will offer another opportunity to get a R3 7* champ to become Valiant. So far, it seems like it would be easier than Necro, but might require more champs to rank up. I almost have the Necro team everyone suggests so it's just about even on my end. Just have to finish leveling up Aegon and Kate (been playing for years and just got Aegon a few months ago). Then grind a few more units/revives.
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Of course you could always do both and further improve your roster.
While you can use r4 and add boost, i highly doubt a paragon player would have the diverse roster of r4 6* to do the crucible without dropping a lot of revives.
As long as you can farm revives, necro with aegon if you have him would probably be easier and more straight forward.