Opal Guardian #30
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Card Details
When an opponent casts a creature spell, if this permanent is an enchantment, this enchantment 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.”
Illustrated by Christopher Rush
Rulings (4)
Sep 25, 2006
A face-down creature spell will cause Opal Guardian's ability to trigger (if it's an enchantment).
Sep 25, 2006
After the triggered ability resolves, Opal Guardian is no longer an enchantment.
Sep 25, 2006
Guardian's effect doesn't wear off.
Aug 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 their most recent turn. It doesn't matter how long the permanent has been a creature.