Badges are a type of Cosmetic that you can get in Crates or buy. You can equip the ones you have (or view the ones you don't) from the "Badge" option in the Player Menu, and the one you choose can be set for all your Decks, or the current one you're using.
Badges appear above your Avatar or in the "Victory/Defeat" window (the Battle Report). They only function as a visual "treat" and for Players to stylize their gameplay.
Collection[]
You can get Badges for free from Events Crates (better chances of getting one after 8 wins minimum), from Battle Pass rewards (related to the focused Faction at the time), or buy them from the Daily Shop (the cost in Gems is equal to the rarity the Badge have).
You can also buy them (when available) from the Web Shop, with real money.
All Badges[]