Breaking News As mentioned above, each Outlaws of Thunder Junction Play Booster contains a Breaking News card
Black in Theros: Beyond Death also combines a mixture of nasty instant spells like Final Death, which exiles a creature immediately, and the delightful Eat to Extinction, which devours the opponent creature - like the rotted black giant depicted on the card
This means it's not possible to cheat creatures into play out of nowhere (which madness can do), but it also means you're granted more flexibility, because you can cast a spell for its mayhem cost at any point during the turn in which it was discarded (rather than having to choose immediately as per madness rules)
Basically, it's a super-janky version of Splinter Twin
You can grab removal dragons, token/value dragons like Miirym or Lathliss , or pure damage finishers whatever fits the board