Board Thread:Questions and Answers/@comment-77.102.150.102-20160229145031/@comment-108.45.128.46-20160302185750

One piece of advice is to get Juggernaut up to 5/5 and then lose the other 1-stars. He's able to handle the 1-star daily by himself every day.

The transition from mostly 2-stars to mostly 3-stars can take a while, but if you really focus on about four or five 2* (I use Storm, OBW, Thor, with Wolverine and Magneto as alternates), they can do the daily for a 3-star cover most of the time at max level.

For 3-stars, it's kind of just luck on which you can get multiple covers for, which is why you want to have as many roster slots open for them as possible (by minimizing your 1s and 2s).

More experienced players can probably offer better guidance on the best 3-stars to keep.