The Mightstone and Weakstone
Legendary Artifact - Powerstone
(CMC 5)
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.)
- [BRO] The Brothers' War #238a (R)