Opal-Akrolith

Wenn einer Deiner Gegner erfolgreich einen Kreaturenzauber spricht und der Opal-Akrolith eine Verzauberung ist, wird der Opal-Akrolith zu einer 2/4 Kreatur, die als Wächter zählt.
0: Der Opal-Akrolith wird zu einer Verzauberung.

Acrolito de ópalo

Télamon d'opale

Acrolito Opalino

オパールの立身像

Acrólita de Opala

Opal Acrolith

Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature.
{0}: This permanent becomes an enchantment.

Urza's Saga

Whenever one of your opponents successfully casts a creature spell, if Opal Acrolith is an enchantment, Opal Acrolith becomes a 2/4 creature that counts as a Guardian.
o0: Opal Acrolith becomes an enchantment.

Changes into a creature even if the spell is countered.

It triggers when the spell is cast, which means it becomes a creature before that spell resolves.

When it turns into a creature, it is no longer an enchantment.

When it turns into an enchantment, it is no longer a creature.

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.

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.