Hidden Herd #262
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Card Details
When an opponent plays a nonbasic land, if this permanent is an enchantment, it becomes a 3/3 Beast creature.
Illustrated by Andrew Robinson
Rulings (3)
Oct 4, 2004
Does not trigger on lands put onto the battlefield by a spell or ability.
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.