>>715735642
Others have already answered, the twelve episode anime and the movie Rebellion, but there is also an anime adaptation of Record, the previous gacha.
It's far from required viewing, but might help you appreciate some of the other characters you will be rolling for in Exedra.
Worth noting though that both Record, AND the original Madoka Magica anime are both recapped/adapted into the first few hours of Exedra. Do with that information what you will