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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.

The copiable values granted by Metamorphic Alteration are locked in as the creature is chosen. The enchanted creature won't change if the chosen creature's copiable values change.

If the chosen creature is a token, Metamorphic Alteration copies the original characteristics of that token as stated by the effect that put the token onto the battlefield. The enchanted creature doesn't become a token in this case.

If the chosen creature is copying something else (for example, if the chosen creature is enchanted by another Metamorphic Alteration), then the enchanted creature becomes a copy of whatever the chosen creature copied.

The enchanted creature will be a copy of the chosen creature as it dies, so any "when this creature dies" abilities it gains from the copy effect will trigger. Any "when this creature dies" abilities it normally has will not trigger.

If Metamorphic Alteration somehow enters the battlefield at the same time as another creature, it can't have the enchanted creature become a copy of that creature. You may choose only a creature that's already on the battlefield.

Metamorphic Alteration can cause a creature to become a copy of itself. This generally has no effect, but if that creature has a pair of linked abilities, the new abilities it has from the copy effect aren't linked to the abilities it had before.

If the chosen creature isn't normally a creature (for example, if the chosen creature is an animated Treetop Village), the enchanted creature becomes a copy of that noncreature permanent. This causes Metamorphic Alteration to be illegally attached, and it's put into its owner's graveyard. The previously enchanted creature returns to being itself.

The characteristics that will be copied are determined as Metamorphic Alteration's effect first begins to apply. If the copiable values of the chosen creature change later, or if that creature leaves the battlefield, the enchanted creature's characteristics are unaffected.

Metamorphic Alteration copies exactly what is printed on the chosen creature (unless that creature is copying something else or is a token; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on.

You can choose only a creature on the battlefield.