Veiled Sentry

{U} · Enchantment

When an opponent casts a spell, if this permanent is an enchantment, it becomes an Illusion creature with power and toughness each equal to that spell's mana value.

Motor: se resuelve a mano

Rulings (4)

If the spell is no longer on the stack when the triggered ability resolves, the mana value of the spell is still remembered.
Wizards of the Coast · 2004-10-04
It changes into a creature even if the spell is countered.
Wizards of the Coast · 2004-10-04
It triggers when the spell is cast, which means it becomes a creature before that spell resolves.
Wizards of the Coast · 2004-10-04
When it turns into a creature, it is no longer an enchantment.
Wizards of the Coast · 2004-10-04