The ability can target a tapped creature. If the targeted creature is already tapped when it resolves, that creature just remains tapped and doesn’t untap during its controller’s next untap step.
Tidebinder Mage
If you gain control of the creature that’s being prevented from untapping, that creature won’t untap during your untap step for as long as you control Tidebinder Mage.
If you lose control of Tidebinder Mage between when it entered the battlefield and when the ability resolves, the target creature will become tapped. However, it won’t be affected by the other effect and will untap as normal during its controller’s untap step.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. John Severin Brassell
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
