Resources

Magic: The Gathering Comprehensive Rules Changes

Time Spiral to Planar Chaos (Single Change View)

General changes

Old rule (Time Spiral) New rule (Planar Chaos)

310.5.

At the start of the combat damage step, if at least one attacking or blocking creature has first strike (see rule 502.2) or double strike (see rule 502.28), creatures without first strike or double strike don't assign combat damage. Instead of proceeding to end of combat, the phase gets a second combat damage step to handle the remaining creatures. In the second combat damage step, surviving attackers and blockers that didn't assign combat damage in the first step, plus any creatures with double strike, assign their combat damage.

310.5.

At the start of the combat damage step, if at least one attacking or blocking creature has first strike (see rule 502.2) or double strike (see rule 502.28), creatures without first strike or double strike don't assign combat damage. Instead of proceeding to end of combat, the phase gets a second combat damage step (see rule 310.1) to handle the remaining creatures. In the second combat damage step, any attackers and blockers that didn't assign combat damage in the first step, plus any creatures with double strike, assign their combat damage.