Whenever one or more creatures you control attack, each defending player divides all creatures without flying (This creature can't be blocked except by creatures with flying or reach.) they control into a "left" pile and a "right" pile. Then, for each attacking creature you control, choose "left" or "right." That creature can't be blocked this combat except by creatures with flying (This creature can't be blocked except by creatures with flying or reach.) and creatures in a pile with the chosen label.
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