Karn, Argent Defender
Legendary Artifact Creature — Golem
"I owe the Multiverse a debt I fear I can never repay. That remedy begins now, with a first step away from the past and toward the future I wish to see."
Rulings (5)
If Karn, Argent Defender and another artifact or creature enter the battlefield at the same time, neither one will cause triggered abilities to trigger when they enter the battlefield.
Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities are triggered abilities and will have "when," "whenever," or "at the beginning of" in their reminder text.
Look at the permanent as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger. For example, if you control Opalescence, which says, in part, "Each other non-Aura enchantment is a creature," each enchantment will be a creature at the time it enters the battlefield and will not cause triggered abilities to trigger.
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