Selling 4*s you already have (preferably unduped) before their basic arena is a great strategy to do if you're able to grind for basics. Even better when it's the recurring basic that goes for no more than 2m. Now selling 20+ champs is a bit much, but if you had to sell a bunch then go for all the ones that have upcoming arenas first.
I've sold 3/30 Joe Fixit 3 times and never regretted it. I would sell Kamala, Spider Gwen, Hulk Buster, Iron Patriot and others if I wanted a crack at a particular featured. Haven't sold a champ in a long time but it's not that big a deal. 4*s are becoming less valuable and some of them have always been garbage. Having said that, I wouldn't sell often.
Selling so many 4* champs for a slim chance of getting Yondu is unwise. Sure, if it gave you 10 of those crystals than maybe, but for 1 crystal? No way you're pulling him, that's not how the crystals are designed. You'll regret it.
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