Double strike



A creature with double strike deals damage during the first combat damage step alongside creatures with first strike, then additionally deal damage during the second damage step along with regular creatures.

Example
Abby attacks with a Two-Headed Cerberus, which Nadine then blocks with a Brindle Boar. In the first strike damage step, the Cerberus will deal one damage to the Brindle Boar, but not receive any damage. Then, in the second damage step, the Cerberus will deal a second damage to the Boar, and the Boar will deal two damage to the Cerberus; killing them both.

Comprehensive Rules
702.4. Double Strike


 * 702.4a. Double strike is a static ability that modifies the rules for the combat damage step. (See rule 510, "Combat Damage Step.")


 * 702.4b. If at least one attacking or blocking creature has first strike (see rule 702.7) or double strike as the combat damage step begins, the only creatures that assign combat damage in that step are those with first strike or double strike. After that step, instead of proceeding to the end of combat step, the phase gets a second combat damage step. The only creatures that assign combat damage in that step are the remaining attackers and blockers that had neither first strike nor double strike as the first combat damage step began, as well as the remaining attackers and blockers that currently have double strike. After that step, the phase proceeds to the end of combat step.


 * 702.4c. Removing double strike from a creature during the first combat damage step will stop it from assigning combat damage in the second combat damage step.


 * 702.4d. Giving double strike to a creature with first strike after it has already dealt combat damage in the first combat damage step will allow the creature to assign combat damage in the second combat damage step.


 * 702.4e. Multiple instances of double strike on the same creature are redundant.