Rule evolution
Rule 509.1a
Earliest archived Rules release: 2009-10-01 · 2 wording revisions · 0 renumberings
Earliest archived Rules release509.1aDetails
The defending player chooses which creatures that he or she controls, if any, will block. The chosen creatures must be untapped. For each of the chosen creatures, the defending player chooses one creature for it to block that's attacking him, her, or a planeswalker he or she controls.
Wording changed509.1aDetails
The defending player chooses which creatures
thattheyhe or she controlscontrol, if any, will block. The chosen creatures must be untapped. For each of the chosen creatures, the defending player chooses one creature for it to block that's attackinghim,thather,player or a planeswalkerhetheyor she controlscontrol.Wording changed509.1aDetails
The defending player chooses which creatures they control, if any, will block. The chosen creatures must be untapped and they can't also be battles. For each of the chosen creatures, the defending player chooses one creature for it to block that's attacking that player,
ora planeswalker they control, or a battle they protect.