Aladdin - The Cave of Wonders
The Cave of Wonders first came out April 2nd, 2020. It has since come out two more times in June and in October. You will need Aladdin, Jasmine, and Genie in order to unlock Jafar. All three of them are available to be farmed on energy nodes in Heroic or Villain Campaigns.
This event is expected next at the beginning of April.