Ultron and Apoc, but you need a more diverse roster like said above by Licky.
Which one? Because I can really only r5 one, it will be a while before I get another 5* to r5. Also yeah I'm trying to get a more diverse roster, especially for battlegrounds
6.1.1 needs a heal block for sabertooth. Both can do it, but it depends on your level of despair. I'd personally would do Apoc if you can play him well, but Ultron has that nice Regen which helps with no retreat. However, it's harder to get those debuffs to help with despair.
Comments
Lots of guides out there. Do the research so you who works for what and save your resources for the key champs you need.
Nick Fury awakened if you can pull him
And Scorpion
But lots of guides out there as said above
Good luck and tag me if you need any more help