Opal Archangel

Enchantment    (CMC:5)

When one of your opponents successfully casts a creature spell, if Opal Archangel is an enchantment, Opal Archangel becomes a 5/5 creature with flying that counts as an Angel. Attacking does not cause Opal Archangel to tap.

23 UZ • ENJeff Miracola

™ & © 1993—1998 Wizards of the Coast

Legal in: Urza Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Opal Archangel {4}{W} Enchantment When an opponent casts a creature spell, if Opal Archangel is an enchantment, Opal Archangel becomes a 5/5 Angel creature with flying and vigilance.

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View this MTG card on Gatherer

10/4/2004
When it turns into a creature, it is no longer an enchantment.
10/4/2004
It changes into a creature even if the spell is countered.
10/4/2004
It triggers when the spell is cast, which means it becomes a creature before that spell resolves.
4/1/2008
A "creature spell" is any spell with the type Creature, even if it has other types such as Artifact or Enchantment. Older cards of type Summon are also Creature spells.
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 Archangel is not on TCGPlayer.