Strionic Resonator targets a triggered ability that has triggered and is on the stack and creates another instance of that ability on the stack. It doesn't cause any object to gain an ability.
Strionic Resonator
If a triggered ability is linked to a second ability, copies of that triggered ability are also linked to that second ability. If the second ability refers to "the exiled card," it refers to all cards exiled by the triggered ability and the copy. For example, if Fiend Hunter's enters-the-battlefield ability is copied and two creatures are exiled, they both return when Fiend Hunter leaves the battlefield.
Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]."
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Noah Bradley
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