The Mightstone and Weakstone
From The Brothers' War set
The Mightstone and Weakstone
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.)