The Mightstone and Weakstone [The Brothers' War Prerelease Promos] Kobold Shaman Set: Grand Prix Promos Type:

Set: Grand Prix Promos Type: Basic Land — Island Rarity: Rare ({T}: Add {U}

Set: Core Set 2019 Prerelease Promos Type: Artifact Rarity: Rare Cost: {3} {4}

and it can be played on its own or combined with the original One Night Ultimate Werewolf game

then discards two cards

astronomer of Meletis

The Mightstone and Weakstone [The Brothers' War Prerelease Promos] Kobold Shaman Set: Grand Prix Promos Type:Set: 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.)