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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.

Nim Deathmantle's color-changing and type-changing effects override the equipped creature's previous colors and creature types. After Nim Deathmantle becomes equipped to a creature, that creature will be a black Zombie, not any other colors or creature types.

Once Nim Deathmantle returns a card from your graveyard to the battlefield, it will remain on the battlefield indefinitely, even if Nim Deathmantle becomes unattached from it.

Once Nim Deathmantle becomes unattached from a creature, its color-changing and type-changing effects stop affecting that creature. The creature will no longer be black and will no longer be a Zombie (unless its printed characteristics or some other effects still cause it to be black and/or a Zombie, of course). This is true even if Nim Deathmantle returned that creature to the battlefield from the graveyard.

If the nontoken creature that caused Nim Deathmantle's second ability to trigger is somehow removed from your graveyard before that ability resolves, you may still pay {4} as it resolves. Even if you do, however, no card will be returned to the battlefield.

Nim Deathmantle's second ability may return a card it can't equip to the battlefield. For example, if a nontoken artifact that's become a creature is put into your graveyard from the battlefield, Nim Deathmantle's second ability triggers. If you pay {4} as it resolves, you'll return that card to the battlefield. However, Nim Deathmantle can't equip it, so Nim Deathmantle remains attached to whatever it was already equipping (or, if it was unattached, it remains so). The same is true if a nontoken creature with protection from artifacts is put into your graveyard from the battlefield, for example.

Nim Deathmantle causes the equipped creature to be a black Zombie even if it didn't return that creature to the battlefield from the graveyard.

You choose whether to pay {4} as Nim Deathmantle's second ability resolves. Although players may respond to this ability, once it begins to resolve and you decide whether to pay, it's too late for players to respond.

If multiple nontoken creatures are put into your graveyard from the battlefield at the same time, Nim Deathmantle's second ability triggers that many times. You put the triggered abilities on the stack in any order, so you'll determine in which order they resolve. If you pay {4} more than once, each card you paid {4} for will end up on the battlefield under your control, and Nim Deathmantle will end up attached to the last card that returned to the battlefield this way that it could equip.