Forum:Explanation of Spiritual Forest

I'd like an explanation to the effect of Spiritual Forest. What exactly does it do? It says, and I quote:

"A face-up Plant, Beast, or Beast-Warrior-Type monster you control is not destroyed by battle once. This effect can only be used once per turn."

The wording throws me off: does this apply to only one monster per turn, or all appropriate monsters? Is the destruction prevention just once for each monster for the entire duel, or just once for that turn? I'm not sure what they mean by this. 68.58.148.71 19:35, 15 July 2009 (UTC)