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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.

Even if not all players can look at the exiled cards, each card’s owner is still known. It is advisable to keep cards owned by different players in distinct piles in case another player gains control of Bane Alley Broker and exiles one or more cards with it.

If Bane Alley Broker leaves the battlefield, the cards exiled with it will be exiled indefinitely. If it later returns to the battlefield, it will be a new object with no connection to the cards exiled with it in its previous existence. You won’t be able to use the “new” Bane Alley Broker to return cards exiled with the “old” one.

Bane Alley Broker’s second and third abilities apply to cards exiled with that specific Bane Alley Broker, not any other creature named Bane Alley Broker. You should keep cards exiled by different Bane Alley Brokers separate.

Once you are allowed to look at a face-down card in exile, you are allowed to look at that card as long as it’s exiled. If you no longer control Bane Alley Broker when its last ability resolves, you can continue to look at the relevant cards in exile to choose one to return.

If Bane Alley Broker’s first ability resolves when you have no cards in your hand, you’ll draw a card and then exile it. You won’t have the opportunity to cast that card (or do anything else with it) before exiling it.