2019-01-25 : Casting an exiled card causes it to leave exile. You can't cast it multiple times.

2019-01-25 : Damage dealt to a player causes that player to lose that much life.

2019-01-25 : In a multiplayer game, if an opponent loses life during your turn and then leaves the game, you can play cards exiled with Theater of Horrors.

2019-01-25 : Theater of Horrors doesn't change when you can play the exiled cards during your turn. For example, if you exile a sorcery card, you can cast it only during your main phase when the stack is empty. If you exile a land card, you can play it only during your main phase and only if you have an available land play remaining.