The Mightstone and Weakstone [The Brothers' War: Prerelease Promos] P-284 the Imperial Royal Guard is

the Imperial Royal Guard is sure to follow

put a spite counter on Curse of Vengeance

parchments and purity seals

Add 1 card with [Growlmon] or [Gallantmon] in its name and 1 [Takato Matsuki] among them to your hand

The Mightstone and Weakstone [The Brothers' War: Prerelease Promos] P-284 the Imperial Royal Guard isSet: 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.)