Weakstone's Subjugation

Subjugação da Pedra de Fraqueza (Weakstone's Subjugation) (pt)

Enchantment - Aura (CMC 1)
Enchant artifact or creature
When Weakstone's Subjugation enters the battlefield, you may pay . If you do, tap enchanted permanent.
Enchanted permanent doesn't untap during its controller's untap step.