Turn your players into beta-testers

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It looks like new characters lack play testing prior their releases. So here is the idea how to test them with the help of your players.
Make a pre-release mini event (something like DDQ) with that character as a loaner. Ta-Da!!! Everybody's happy. Players get to play another fun event. Developers get the data to make tweaks to the character before it's released. You can even tailor this event for your specific testing needs. For example, if you're worried it could make winfinite combos give a prize for a win with firing 7+ powers on the final turn and players will be eager to find those potential combos just by playing the game.