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If an ability would produce one or more mana of an undefined type, it produces no mana instead.

Some abilities produce mana based on the type of mana another permanent or permanents “could produce.” The type of mana a permanent could produce at any time includes any type of mana that an ability of that permanent would produce if the ability were to resolve at that time, taking into account any applicable replacement effects in any possible order. Ignore whether any costs of the ability could or could not be paid. If that permanent wouldn’t produce any mana under these conditions, or no type of mana can be defined this way, there’s no type of mana it could produce.

To “tap [a permanent] for mana” is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, “Mana Abilities.”

An ability that triggers whenever a permanent “is tapped for mana” or is tapped for mana of a specified type triggers whenever such a mana ability resolves and produces mana or the specified type of mana.

A replacement effect that applies if a permanent “is tapped for mana” or tapped for mana of a specific type and/or amount modifies the mana production event while such an ability is resolving and producing mana or the specified type and/or amount of mana.

If an object’s enters-the-battlefield triggered ability or replacement effect refers to X, and the spell that became that object as it resolved had a value of X chosen for any of its costs, the value of X for that ability is the same as the value of X for that spell, although the value of X for that permanent is 0. This is an exception to rule 107.3i.

The tap symbol is {T}. The tap symbol in an activation cost means “Tap this permanent.” A permanent that’s already tapped can’t be tapped again to pay the cost. A creature’s activated ability with the tap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

The untap symbol is {Q}. The untap symbol in an activation cost means “Untap this permanent.” A permanent that’s already untapped can’t be untapped again to pay the cost. A creature’s activated ability with the untap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

“To Solve — [condition]” means “At the beginning of your end step, if [condition] and this Case is not solved, it becomes solved.”

If the spell that’s copied has an X whose value was determined as it was cast, the copy has the same value of X.

You can’t choose to pay any additional costs for a copied spell. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.

If a permanent spell is copied, it’s put onto the battlefield as a token as the spell resolves rather than putting the copy of the spell onto the battlefield. The rules that apply to a permanent spell becoming a permanent apply to a copy of a spell becoming a token.

Each Case has two special keyword abilities: to solve and solved.

The token that a resolving copy of a permanent spell becomes isn’t “created” and won’t interact with abilities that care about tokens being created, such as that of Case of the Pilfered Proof.

“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.

“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 {1} less to cast.”

The copy is created on the stack, so it’s not “cast.” Creating the copy won’t cause abilities that trigger when a player casts a spell to trigger.

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.

The triggered ability Case of the Shifting Visage has when it’s solved and the copy it creates will resolve before the spell that caused the ability to trigger.

Once a Case becomes solved, it stays solved until it leaves the battlefield.

Cases don’t lose their other abilities when they become solved.

“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].”

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].”

Any choices made when the spell resolves won’t have been made yet when it’s copied. Any such choices will be made separately when the copy resolves.