Hidden Ancients #260
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Card Details
When an opponent casts an enchantment spell, if this permanent is an enchantment, it becomes a 5/5 Treefolk creature.
“The only alert the invaders had was the rustling of leaves on a day without wind.”
Illustrated by Daren Bader
Rulings (3)
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.