Which 5* should I Rank to R4?

I should be able to rank 2 x 5 Stars champs up to R4 within a 1 month.
I'm hoping to achieve Uncollected soon after.
Would like the community advice on which 2 champs will help me get to Uncollected.
I'm hoping to achieve Uncollected soon after.
Would like the community advice on which 2 champs will help me get to Uncollected.
Which 5* should I Rank to R4? 16 votes
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@Sarvanga1_ , I do enjoy using Warlock, so that is great to know.
It seem very clear that Warlock and Magneto are the 2 clear winner.
I will work toward doing at, just need some Cat 4 Tech and Alpha 2 (need to 100% Act 4).
Many thanks for everyone vote and advice.