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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 the targeted permanent is a token, the new token copies the characteristics of the original token as stated by the effect that put it onto the battlefield.

If the targeted permanent is an Aura, you choose a legal permanent, player, or other card for the token to enchant as it enters. A permanent you choose must be able to be enchanted by the token. (For example, if the Aura it's copying is red and has "enchant creature," the permanent must be a creature, and it can't have protection from red.) Since the token Aura wasn't cast as a spell, it doesn't target what it will enchant; you may choose something that has shroud, for example. As the ability resolves, no player can respond between the time you choose what the token will enchant and the time it enters. If you can't choose something for the token to enchant, it enters unattached, then is put into your graveyard as a state-based action.

You can target any permanent an opponent controls, not just a creature.

The token that's put onto the battlefield copies exactly what's printed on the targeted permanent (unless that permanent is copying something else or it's a token; see below). It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or whether it's been affected by any noncopy effects that changed its power, toughness, types, color, or so on.

Any "enters" abilities of the targeted permanent will trigger when the token is put onto the battlefield. Any "as [this permanent] enters" or "[this permanent] enters with" abilities of that permanent will also work.

If the targeted permanent is copying something else when the ability resolves (for example, if it's a Clone), then the token enters as a copy of whatever that permanent is copying.

If the targeted permanent has {X} in its mana cost (such as Protean Hydra), X is considered to be zero.

If the targeted permanent leaves the battlefield before the ability resolves, the ability doesn't resolve. You don't get a token.