Opal Guardian

Enchantment    (CMC:3)

When an opponent casts a creature spell, if Opal Guardian is an enchantment, Opal Guardian becomes a 3/4 Gargoyle creature with flying and protection from red.

It was a moment in time, cast in stone—a moment whose time had come again.

30 TSP • ENChristopher Rush

™ & © 1993—2006 Wizards of the Coast

Legal in: Modern,Time Spiral Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Opal Guardian {W}{W}{W} Enchantment When an opponent casts a creature spell, if Opal Guardian is an enchantment, Opal Guardian becomes a 3/4 Gargoyle creature with flying and protection from red.

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9/25/2006
Guardian's effect doesn't wear off.
9/25/2006
After the triggered ability resolves, Opal Guardian is no longer an enchantment.
9/25/2006
A face-down creature spell will cause Opal Guardian's ability to trigger (if it's an enchantment).
8/1/2008
A noncreature permanent that turns into a creature can attack, and its  abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of his or her most recent turn. It doesn't matter how long the permanent has been a creature.

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Card Opal Guardian is not on TCGPlayer.