Nature Shields Its Own | Magic: The Gathering
Formats Nature Shields Its Own is Legal in
Official Oracle Text for Nature Shields Its Own
Whenever a creature attacks and isn't blocked, if you're the defending player, put a 0/1 green Plant creature token onto the battlefield blocking that creature.
When four or more creatures attack you, abandon this scheme at end of combat.
Official Rulings for Nature Shields Its Own
6/15/2010 : For each unblocked creature attacking you, you must put a Plant token onto the battlefield blocking it, even if you don't want to.
6/15/2010 : The Plant token blocks the attacking creature even if the block couldn't legally be declared (for example, if the attacking creature has flying).
6/15/2010 : Putting a blocking creature onto the battlefield doesn't trigger "Whenever a creature blocks" abilities. It also won't check blocking restrictions, costs, or requirements.
6/15/2010 : Putting a blocking creature onto the battlefield will trigger "When this creature becomes blocked by a creature" abilities. It will also trigger "When this creature becomes blocked" abilities in this case, because the attacking creature had not yet been blocked that combat.
6/15/2010 : The last ability triggers only if four or more creatures were declared as attackers during your opponents' declare attackers step. Only creatures attacking you are counted; creatures attacking your planeswalkers are not. The creatures may be controlled by different players.