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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.

In a Two-Headed Giant game, Captive Audience’s first mode causes its controller to gain or lose life so that their team’s life total becomes 4.

In a multiplayer game, if Captive Audience’s owner leaves the game, Captive Audience leaves the game with them. If Captive Audience’s controller leaves the game, Captive Audience is exiled (assuming that player wasn’t also Captive Audience’s owner).

For a player’s life total to become 4, that player gains or loses the appropriate amount of life. For example, if a player’s life total is 20, Captive Audience will cause that player to lose 16 life; alternatively, if their life total is 1, it will cause them to gain 3 life. Other cards that interact with life gain or life loss will interact with this effect accordingly.

If all three modes have been chosen, Captive Audience’s triggered ability is removed from the stack with no effect, but Captive Audience remains on the battlefield.

Once Captive Audience is controlled by your opponent, its ability triggers during that player’s upkeep and that player makes all choices for it. That player is affected by its first two modes, and that player’s opponents create the tokens for its last mode.

You may choose Captive Audience’s first mode even if your life total is already 4. Similarly, you may choose its second mode even if you have no cards in hand.