Case of the Uneaten Feast

• WWizards of the Coast2024-02-02
  Official Ruling
  Once a Case becomes solved, it stays solved until it leaves the battlefield.
• WWizards of the Coast2024-02-02
  Official Ruling
  "To Solve — [condition]" means "At the beginning of your end step, if [condition] and this Case is not solved, it becomes solved."
• WWizards of the Coast2024-02-02
  Official Ruling
  "To solve" abilities will check for their condition twice: once when the ability would trigger, and once when it resolves. If the condition isn't true at the beginning of your end step, the ability won't trigger at all. If the condition isn't true when the ability resolves, the Case won't become solved.
• WWizards of the Coast2024-02-02
  Official Ruling
  The meaning of "solved" differs based on what type of ability follows it. "Solved — [activated ability]" means "[Activated ability]. Activate only if this Case is solved." Activated abilities contain a colon. They're generally written "[Cost]: [Effect]."
• WWizards of the Coast2024-02-02
  Official Ruling
  Being solved is not part of a permanent's copiable values. A permanent that becomes a copy of a solved Case is not solved. A solved Case that somehow becomes a copy of a different Case stays solved.
• WWizards of the Coast2024-02-02
  Official Ruling
  Cases don't lose their other abilities when they become solved.
• WWizards of the Coast2024-02-02
  Official Ruling
  "Solved — [static ability]" means "As long as this Case is solved, [static ability]." Static abilities are written as statements, such as "Creatures you control get +1/+1" or "Instant and sorcery spells you cast cost less to cast."
• WWizards of the Coast2024-02-02
  Official Ruling
  Each Case has two special keyword abilities: to solve and solved.
• WWizards of the Coast2024-02-02
  Official Ruling
  "Solved — [Triggered ability]" means "[Triggered ability]. This ability triggers only if this Case is solved." Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]."

Rulings via Scryfall