When The Mightstone and Weakstone enters the battlefield, choose one —

• Draw two cards.

• Target creature gets -5/-5 until end of turn.

: Add . This mana can't be spent to cast nonartifact spells.

(Melds with Urza, Lord Protector.)

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.