The Mightstone and Weakstone [The Brothers' War Prerelease Promos] Tribal Artifact Whenever an opponent taps a

Whenever an opponent taps a land for mana

That player may search their library for that many basic land cards

Schools meet and mingle on Lorwyn's riverways

Rather than sheltering her young

The Mightstone and Weakstone [The Brothers' War Prerelease Promos] Tribal Artifact Whenever an opponent taps aSet: 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.)