The Mightstone and Weakstone [The Brothers' War] Dominaria United Tokens create X 1/1 red Phyrexian

create X 1/1 red Phyrexian Goblin creature tokens

then exile a nonland card at random from your graveyard

Spend this mana only to cast a planeswalker spell

but a spirit of sand

exile up to two target legendary creature cards from your graveyard

The Mightstone and Weakstone [The Brothers' War] Dominaria United Tokens create X 1/1 red PhyrexianSet: The Brothers' War 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.)