2019-01-25 : A card’s spectacle cost is the same no matter how much life your opponents lost or how many opponents lost life.

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 and later that turn leaves the game, you can cast a spell for its spectacle cost. (If a player leaves the game during their turn, that turn continues without an active player.)

2019-01-25 : Spectacle doesn’t change when you can cast the card. For example, you can’t cast a sorcery with spectacle during an opponent’s turn unless another effect allows you to do so, even if that player has lost life this turn.

2019-01-25 : To determine the total cost of a spell, start with the mana cost or alternative cost you’re paying (such as a spectacle cost), add any cost increases, then apply any cost reductions. The converted mana cost of the spell remains unchanged, no matter what the total cost to cast it was.