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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 somehow control a Mirror of the Forebears with no chosen creature type, its activated ability can’t be activated.

If an effect begins to apply to Mirror of the Forebears before it becomes a copy of another permanent, that effect will continue to apply. For example, if Mirror of the Forebears is activated twice in response to itself targeting first Spirit of the Hearth then Temur Sabertooth, the ability it has while it’s a copy of Temur Sabertooth can be activated and its effect will continue to apply while Mirror of the Forebears is a copy of Spirit of the Hearth.

If Mirror of the Forebears becomes a copy of a legendary creature you control, you’ll put one of them into your graveyard.

If Mirror of the Forebears copies a creature that’s copying something else, it will become whatever the target is copying.

Once the second ability of Mirror of the Forebears resolves, it no longer has that ability.

You must choose an existing creature type, such as Vampire or Cat. Card types such as “artifact” can’t be chosen.

If you activate the second ability of Mirror of the Forebears multiple times in a turn in response to itself, then each time one of those abilities resolves, it will overwrite whatever Mirror of the Forebears is copying. Mirror of the Forebears will wind up as a copy of the permanent targeted by the last ability to resolve. When the turn ends, all instances of the ability will wear off at the same time.

You can’t choose multiple creature types, such as “Cat Warrior.” A Cat Warrior is both a Cat and a Warrior. It’s affected by anything that affects either type and unaffected by things that affect non-Cat or non-Warrior creatures.

Mirror of the Forebears copies the printed values of the target creature, plus any copy effects that have been applied to it. It won’t copy counters on that creature or effects that have changed its power, toughness, types, color, or so on. Notably, it won’t copy effects that made the target creature become a creature.

Mirror of the Forebears becomes an artifact in addition to its other types. This is a copiable value that other effects may copy.

If Mirror of the Forebears becomes a copy of a creature that itself has an ability that asks you to choose a creature type as it enters the battlefield and another ability that references “the chosen creature type,” that ability won’t have a choice made for it. You won’t use the type chosen for Mirror of the Forebears.

If Mirror of the Forebears becomes a creature the same turn it enters the battlefield, you can’t attack with it or use any of its {T} abilities (if it gains any) unless it has haste.