Lieutenant abilities refer only to whether you control your commander, not any other player’s commander.
Demon of Wailing Agonies
If you gain control of a creature with a lieutenant ability owned by another player, that ability will check to see if you control your commander and will apply if you do. It won’t check whether its owner controls their commander.
If you lose control of your commander, lieutenant abilities of creatures you control will immediately stop applying. If this causes a creature’s toughness to become less than or equal to the amount of damage marked on it, the creature will be destroyed.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Dave Kendall
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
