Rules glossary
↑ Section 509. Declare Blockers Step
509.4 If a creature is put onto the battlefield blocking, its controller chooses which attacking creature it’s blocking as it enters the battlefield (unless the effect that put it onto the battlefield specifies what it’s blocking). A creature put onto the battlefield this way is “blocking” but, for the purposes of trigger events and effects, it never “blocked.”
- 509.4a If the effect that puts a creature onto the battlefield blocking specifies it’s blocking a certain creature and that creature is no longer attacking, the creature is put onto the battlefield but is never considered a blocking creature. The same is true if the controller of the creature that’s put onto the battlefield blocking isn’t a defending player for the specified attacking creature.
- 509.4b A creature that’s put onto the battlefield blocking isn’t affected by requirements or restrictions that apply to the declaration of blockers.