Opal Acrolith #22
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Card Details
Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature.
: This permanent becomes an enchantment.
Illustrated by Robh Ruppel
Rulings (6)
Oct 4, 2004
Changes into a creature even if the spell is countered.
Oct 4, 2004
It triggers when the spell is cast, which means it becomes a creature before that spell resolves.
Oct 4, 2004
When it turns into a creature, it is no longer an enchantment.
Oct 4, 2004
When it turns into an enchantment, it is no longer a creature.
Apr 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.
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.