I recently started to farm 8 2s for the rewards and further ahead 4 covers. Ive choosen: Wolverine, Thor, Widow, Torch, Hawkeye, Bullseye, Cap and Ms Marvel. The thing is that i dont have The 3* Ms Marvel. And she is vaulted so i guess it will take forever to get her champed and get the 4* Carol covers. Should i choose another 2* to farm like Magneto or am i wrong about the waste of time champing 3* Ms Marvel?
Eventually you will probably want to farm them all. Lots of people will advise against doing it until you have most or all of the 3s champed. I disagree. I started recycling my 2s as soon as they hit 144 and I never regretted it.
If you make 3* Carol your only 3* bonus hero, you’ll have her built in no time.
The 3* tier isn’t impacted quite as much by vaulting as the 4 and 5* tier. 3* don’t have a dedicated token - you have a small chance of getting them from heroics or elites, but there aren’t any guaranteed pulls like with legendaries/classics. Most of the 3* economy comes from Daily Deadpool, vaults, and event progression/placement, where they’re far more common.
That said, yes, there is some stagnation at the 3* tier. I have a pack that’s clearly jumping out ahead of the others. If C4rol is a priority, setting Marv3l as a bonus hero is a good idea.