Weakstone's Subjugation
Enchantment — Aura
Enchant artifact or creature
When this Aura enters, you may pay 
. If you do, tap enchanted permanent.
Enchanted permanent doesn't untap during its controller's untap step.
Igor Kieryluk
The Brothers' War (BRO)
• #72Rulings
The enchanted permanent doesn't untap during its controller's untap step even if you didn't pay {3}.
(wotc • 2022-10-14)
Rulings
The enchanted permanent doesn't untap during its controller's untap step even if you didn't pay {3}.
(wotc • 2022-10-14)