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.
2016-11-08
wotc
The triggered ability triggers both when Armory Automaton enters the battlefield and whenever it attacks. You don't have to choose only one.
2016-11-08
wotc
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.
2016-11-08
wotc
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.
2016-11-08
wotc
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.
2016-11-08
wotc
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.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Not Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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Commander 2016
Final Fantasy Commander
Treasure Chest