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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.

Replacement effects are unaffected by Hushbringer's ability. For example, a creature that enters the battlefield with one +1/+1 counter on it will still receive a +1/+1 counter, and Leyline of the Void will still exile creatures that would die.

Hushbringer affects a creature's own triggered abilities as well as other triggered abilities that trigger when that creature enters the battlefield or dies. Such triggered abilities start with "when" or "whenever."

A creature entering the battlefield or dying at the same time as Hushbringer (including Hushbringer itself entering or dying) won't cause abilities to trigger.

An ability that triggers when a card is put into a graveyard "from anywhere" may still trigger even if a creature dies. It will trigger if the ability is of a dying creature that triggers only when that creature is put into a graveyard from anywhere, if Hushbringer is the card being put into a graveyard, or if Hushbringer leaves the battlefield at the same time as the dying creature.

The trigger event doesn't have to specifically refer to "creatures." In these cases, the trigger event may also refer to something being "put into a graveyard from the battlefield." For example, an ability that triggers "whenever an artifact is put into a graveyard from the battlefield" won't trigger if an artifact creature dies while Hushbringer is on the battlefield.

An ability that triggers on an event that causes a creature to die will still trigger. For example, an ability that triggers "whenever you sacrifice a creature" still triggers.

Abilities that apply "as [this creature] enters the battlefield," such as choosing a color with Diamond Knight, are unaffected.

An ability that triggers when a creature "leaves the battlefield" won't trigger if that creature leaves the battlefield by dying.

Look at each permanent as it exists on the battlefield, taking into account continuous effects that apply to it after entering or before dying, to determine whether any triggered abilities will be stopped from triggering. For example, if a land that has become a creature dies, an ability that triggers when it dies doesn't trigger.