Hidden Gibbons #104
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$10.94
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Card Details
When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature.
“When these apes want something, it's a matter of gibbon take.”
Illustrated by Una Fricker
Rulings (4)
Oct 4, 2004
It changes into a creature even if the spell is countered.
Oct 4, 2004
When it turns into a creature, it is no longer an enchantment.
Aug 1, 2008
A noncreature permanent that turns into a creature can attack, and its 
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.
Aug 1, 2008
The ability triggers when the spell is cast, so it becomes a creature before the spell resolves.