Opal Guardian

Enchantment, WWW (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.¹
It was a moment in time, cast in stone—a moment whose time had come again.
Illus. Christopher Rush

Gatherer Card Rulings [Nov 2009]

• 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 is subject to the "summoning sickness" rule: It can only attack, and its {T} abilities can only be activated, if its controller has continuously controlled that permanent since the beginning of his or her most recent turn.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (1/9)	Time Spiral (Rare)