Who should my 2nd R4 be?

Just looking for an idea of who to bring to r4 now that I'm approaching harder content. I've finished all the way up to 5.3.3 and my only r4 currently is Venom. Thanks!
Who should my 2nd R4 be? 21 votes
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I also technically have every synergy for every champ except for Nick Fury for CMM
And no need to fret about resources