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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.

If you are casting a spell from your graveyard (for example, a spell with flashback) you can't also exile that card to pay the alternative collect evidence cost offered by Conspiracy Unraveler.

If you cast a spell for another cost "rather than pay its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, such as that of Demand Answers, those must be paid to cast the card.

If you cast a spell with the alternative collect evidence cost offered by Conspiracy Unraveler and you also collect evidence as an additional cost to cast that spell, abilities of permanents that trigger "whenever you collect evidence" will trigger twice. This is also true for abilities that trigger "whenever one or more cards leave your graveyard." For example, let's say you control Conspiracy Unraveler and Evidence Examiner. You cast Crimestopper Sprite and choose to collect evidence 10 rather than pay its mana cost. You also choose to collect evidence 6 as an additional cost. Each of these will cause Evidence Examiner's last ability to trigger, and you'll end up investigating twice.

If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.

If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If a spell has an additional cost that includes collecting evidence, such as that of Analyze the Pollen, any additional effects that occur "if evidence was collected" will occur only if that additional cost was paid. Using the alternative cost from Conspiracy Unraveler will not cause those additional effects to occur.

Once you've announced that you're casting a spell, players can't take actions until you've finished doing so. Notably, opponents can't try to remove cards from your graveyard to stop you from collecting evidence.