: Patience is the biggest advantage in MCOC. Every champion you keep will eventually have a use, whether for a specific monthly event, a side quest, or simply as a "dupe" to give you more resources. As one experienced player put it, "let them sit and rot in the account and use them to your advantage during the aforementioned times". Selling a champion gives you a tiny amount of resources in the short term, but keeping them pays huge dividends in the long term.
Many game modes, such as Back Issues (Variants) or special Arenas , specifically require low-rarity champions (1-star to 4-star). how to sell champions on marvel contest of champions
The removal of the sell feature wasn't arbitrary. There are several key reasons why Kabam decided to take this step: : Patience is the biggest advantage in MCOC