The Mightstone and Weakstone [The Brothers' War: Prerelease Promos] FPx2 You can only use this

You can only use this effect of "Ghost Ogre & Snow Rabbit" once per turn

The imps' warbling cries echo through Phyrexia's towers like those of mourning doves in a cathedral

At the beginning of each end step

Set: Rising Rivals Type: Psychic Rarity: Ultra Rare Retreat cost: 2 [1PP] Mind Shock (50) This attack's damage isn't affected by Weakness or Resistance

The Mightstone and Weakstone [The Brothers' War: Prerelease Promos] FPx2 You can only use thisSet: The Brothers' War: Prerelease Promos Type: Legendary Artifact Powerstone Rarity: Rare Cost: {5} When The Mightstone and Weakstone enters the battlefield, 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.)