Rags doesnt get a lot of love on the forum, but I have champed mine & havent regretted it. He has found a perfect support role with Quicksilver and Kamela Kahn that never requires him to use his Green - especially in wave nodes where they often finish back on full health with all the quick firing powers and Rags double-health dipping with his blue activating KK’s team heal.
I’ve never spent cps to get a final cover for a 3* - usually got the cover I needed eventually without having to sell the excess covers in other colours.
I’m slowly getting 4* covers via progression in PVE, so maybe not the best source on how to more quickly make the move into 4*