Card text
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Official rulings
4 rulings · in English, source ScryfallAfter the triggered ability resolves, Opal Guardian is no longer an enchantment.
2006-09-25 · Wizards of the CoastGuardian's effect doesn't wear off.
2006-09-25 · Wizards of the CoastA face-down creature spell will cause Opal Guardian's ability to trigger (if it's an enchantment).
2006-09-25 · Wizards of the CoastA noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
2008-08-01 · Wizards of the CoastAll printings