The Tower is one of the most violent cards in Tarot. It shows unexpected changes or sudden realizations that in most cases, we are not prepared to face. That said, the Tower can also be the most cathartic card. It removes illusions and opens up new doors. The Seven of Cups is a card of options, daydreaming, procrastination and scattered energies. The combination of the Tower and the Seven of Cups show a release of energy after a sudden, shocking event.
The elements of the cards are Fire (Tower) and Water (Seven of Cups). A poor combination that shows a battle between the two elements, as Fire and Water are enemies. In this case, the fire of the Tower will be weakened by the water of the Seven of Cups, so the blow that the Tower usually represents will be softened, for better or worse.