How To | Sell Champions On Marvel Contest Of Champions [better]

Do not sell duplicates. Just let them pile up in your "Stash." When you open a crystal and get a dupe, the ISO-8 goes to your stash. Let it sit there for 7 days. Only claim it when you have a specific Champion to level. If you don't level anyone, let it expire rather than selling the source Champion.

However, if you search the official forums or ask veteran Summoners, you will receive a near-universal warning: how to sell champions on marvel contest of champions

You get much better rewards (ISO-8, Gold, and Shards) by duplicating a Champion through crystals than you ever did by selling them. Do not sell duplicates

You earn shards for the next rarity tier (e.g., duplicating a 4-star gives you 5-star shards). You get a significant amount of class-specific ISO-8. You receive a gold bonus. 4. Managing Inventory Without Selling Only claim it when you have a specific Champion to level