Sworn to the Legion is a mythic Enchantment card from Alchemy Horizons: Baldur's Gate (HBG), collector number 30.
When Sworn to the Legion enters the battlefield, nontoken creatures you control perpetually gain double team. (When a creature with double team attacks, conjure a duplicate into your hand, then both of them perpetually lose double team.) Whenever you cast a creature spell, it perpetually gains double team.