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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 don't play the card, it will remain exiled.

An "equipped creature you control" is any creature you control with one or more Equipment attached to it.

If you cast an Equipment spell this way, you may choose to pay its mana cost if you want to.

Nahiri's last ability will trigger once for each equipped creature you control that attacks, no matter how many Equipment are attached to any of them.

Unless an effect allows you to play additional lands that turn, you can play a land card exiled with Nahiri only if you haven't played a land yet that turn.

One reason you might want to pay its mana cost is if there's an {X} in its mana cost. If you cast such a spell without paying its mana cost, you must choose 0 as the value of X. (If you pay its mana cost, you may choose the value of X as normal.)

You may play the card exiled with Nahiri's ability even if Nahiri or the equipped creature leaves the battlefield or you lose control of them.

Playing the exiled card follows the normal rules for playing that card. Unless you're casting an Equipment spell this way, you must pay the spell's costs, and you must follow all applicable timing rules. For example, if the card is a creature card, you can cast that card by paying its mana cost only during your main phase while the stack is empty.