If you steal your opponent's commander and attack them with it, would this count towards their "commander damage" life total?
Players can totally be killed with their own Commander's Commander Damage.
Remember that Commander Damage is separate for each Commander, however. Commander Damage from your Commander and from their Commander don't count toward the same Commander Damage. You still have to take 21 from a single Commander to lose, not 21 from all Commanders combined.
















