Hidden Herd

{G} · Enchantment

When an opponent plays a nonbasic land, if this permanent is an enchantment, it becomes a 3/3 Beast creature.

Motor: se resuelve a mano

Rulings (3)

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.
Wizards of the Coast · 2008-08-01
Does not trigger on lands put onto the battlefield by a spell or ability.
Wizards of the Coast · 2004-10-04
When it turns into a creature, it is no longer an enchantment.
Wizards of the Coast · 2004-10-04