Oracle

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.

Tournooi-info

Legal in: Vintage, Legacy, Commander

Officiele rulings

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 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.

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