The Mightstone and Weakstone

Legendary Artifact — Powerstone

The Brothers' War (BRO) · rare

Oracle Text

When The Mightstone and Weakstone enters, choose one —
• Draw two cards.
• Target creature gets -5/-5 until end of turn.
{T}: Add {C}{C}. This mana can't be spent to cast nonartifact spells.
(Melds with Urza, Lord Protector.)