Syr Carah, the Bold

• WWizards of the Coast2019-10-04
  Official Ruling
  Playing an exiled card causes it to leave exile. You can't play it multiple times.
• WWizards of the Coast2019-10-04
  Official Ruling
  If Syr Carah or an instant or sorcery spell you control deals damage to two or more players at the same time, Syr Carah's first ability triggers for each of those players.
• WWizards of the Coast2019-10-04
  Official Ruling
  If you don't play the exiled card, it remains in exile.
• WWizards of the Coast2019-10-04
  Official Ruling
  Syr Carah doesn't change when you can cast the exiled card. 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.
• WWizards of the Coast2019-10-04
  Official Ruling
  Syr Carah's first ability triggers even if Syr Carah is dealt lethal damage at the same time that it or an instant or sorcery spell you control deals damage to a player.

Rulings via Scryfall