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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.

An ability of an Equipment that triggers "whenever equipped creature attacks" triggers only if the Equipment was attached to a creature at the moment that creature was declared as an attacker, and any references to "that creature" in the effect refer to the creature the Equipment was attached to when the ability triggered.

If an Equipment an opponent controls is attached to a creature you control, any ability of that Equipment that says "you" refers to that opponent. However, if the Equipment says that the equipped creature has an ability, the word "you" in that ability refers to you, the controller of the creature.

You can choose to target no Equipment if you don't want to attach any to Armory Automaton. Because the ability is optional, you also don't have to attach the Equipment it targets as you resolve the ability. However, you must either attach all of the target Equipment or attach none of them.

The triggered ability triggers both when Armory Automaton enters the battlefield and whenever it attacks. You don't have to choose only one.

Armory Automaton's ability can cause an Equipment one player controls to become attached to a creature another player controls. The controller of the Equipment can pay the equip cost to attach that Equipment to a creature they control, but only any time that player could cast a sorcery. The controller of Armory Automaton can't activate equip abilities of Equipment they don't control.

If Armory Automaton leaves the battlefield before its ability resolves, nothing happens to any of the Equipment it targeted. If they were already attached to other creatures, they remain attached to those creatures.