name: The Mightstone and Weakstone // Urza, Planeswalker
printings: BRO, PBRO
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.)
type: Legendary Artifact — Powerstone