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.
Armory Automaton
The triggered ability triggers both when Armory Automaton enters the battlefield and whenever it attacks. You don't have to choose only one.
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.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Gas1
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