Venom maybe (I haven't used him since I don't have him, but others could say it) overall you got a great team, I suggest you give it a go and if you get stuck, let us know.
You can probably get cav with your current roster. The only champion that you don’t have a strong counter for is the 6.1.2 ultron. (I think cull might be able to do it but I’m not sure.) I suggest rank 5ing warlock when you get the t5b. The only person who isn’t currently ranked up that I suggest ranking up is venom.
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overall you got a great team, I suggest you give it a go and if you get stuck, let us know.