Veiled Serpent

{2}{U} · Enchantment

When an opponent casts a spell, if this permanent is an enchantment, it becomes a 4/4 Serpent creature with "This creature can't attack unless defending player controls an Island." Cycling {2} ({2}, Discard this card: Draw a card.)

Motor: se resuelve a mano

Rulings (4)

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.
Wizards of the Coast · 2008-08-01
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