Any enters-the-battlefield abilities of the copied enchantment will trigger when Estrid's Invocation enters the battlefield. Any "as [this enchantment] enters the battlefield" or "[this enchantment] enters the battlefield with" abilities of the chosen enchantment will also work.
Estrid's Invocation
If Estrid's Invocation somehow enters the battlefield at the same time as another enchantment, it can't become a copy of that enchantment. You may choose only an enchantment that's already on the battlefield.
Once Estrid's Invocation returns, it's considered a new object with no relation to the object that it was. You must choose an enchantment that's currently on the battlefield to copy (or to not copy anything). Auras that were attached to it will be put into their owners' graveyards. Any counters that were on it cease to exist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Johannes Voss
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