The Mightstone and Weakstone [The Brothers' War: Prerelease Promos] FPx2 The imps' warbling cries echo

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

you may have target opponent discard a card

At the end of your upkeep

(Leads to: Arena

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

The Mightstone and Weakstone [The Brothers' War: Prerelease Promos] FPx2 The imps' warbling cries echoSet: 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.)