Veiled Serpent
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.)
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Official rulings (4) · Scryfall
It triggers when the spell is cast, which means it becomes a creature before that spell resolves.
It changes into a creature even if the spell is countered.
When it turns into a creature, it is no longer an enchantment.
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.