Opal Acrolith

Text:

Whenever an opponent casts a creature spell, if Opal Acrolith is an enchantment, Opal Acrolith becomes a 2/4 Soldier creature.
: Opal Acrolith becomes an enchantment.

Rulings:

• 10/4/2004 When it turns into an enchantment, it is no longer a creature.
• 10/4/2004 Changes into a creature even if the spell is countered.
• 10/4/2004 When it turns into a creature, it is no longer an enchantment.
• 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 <img src="/Handlers/Image.ashx?size=small&amp;name=tap&amp;type=symbol" alt="Tap" align="absbottom" /> 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.