Hidden Gibbons

Enchantment, G (1)
When an opponent casts an instant spell, if Hidden Gibbons is an enchantment, Hidden Gibbons becomes a 4/4 Ape creature.¹
When these apes want something, it's a matter of gibbon take.
Illus. Una Fricker

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: When it turns into a creature, it is no longer an enchantment.
• 10/4/2004: It changes into a creature even if the spell is countered.
• 8/1/2008: The ability triggers when the spell is cast, so it becomes a creature before the spell resolves.
• 8/1/2008: A noncreature permanent that turns into a creature is subject to the "summoning sickness" rule: It can only attack, and its {T} abilities can only be activated, if its controller has continuously controlled that permanent since the beginning of his or her most recent turn.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard, MTGO Classic
Printings (1/6)	Urza's Legacy (Rare)