The Mightstone and Weakstone // Urza, Planeswalker Foil

Legendary Artifact — Powerstone

When The Mightstone and Weakstone enters, 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.)