Historical Rules · 30 September 2011
Rule 508.6
Official source text from the 30 September 2011 Rules release
If no creatures are declared as attackers or put onto the battlefield attacking, skip the declare blockers and combat damage steps.
Historical Rules · 30 September 2011
Official source text from the 30 September 2011 Rules release
If no creatures are declared as attackers or put onto the battlefield attacking, skip the declare blockers and combat damage steps.