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When an opponent casts an instant spell, if Hidden Gibbons is an enchantment, Hidden Gibbons becomes a 4/4 Ape creature.
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.
The ability triggers when the spell is cast, so it becomes a creature before the 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.
