Mirror Box [Kamigawa: Neon Dynasty Prerelease Promos] Ancient Dragon/Tem Warriors Set: Sword & Shield: Brilliant

Set: Sword & Shield: Brilliant Stars Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Set: Sun & Moon: Lost Thunder Type: Psychic Rarity: Promo Retreat cost: 3

Discard a card: Proliferate

Whenever you attack with Merry and another legendary creature

{T}: Each player gains control of all creatures they own

Mirror Box [Kamigawa: Neon Dynasty Prerelease Promos] Ancient Dragon/Tem Warriors Set: Sword & Shield: BrilliantSet: Kamigawa: Neon Dynasty Prerelease Promos Type: Artifact Rarity: Rare Cost: {3} The "legend rule" doesn't apply to permanents you control. Each legendary creature you control gets +1 +1. Each nontoken creature you control gets +1 +1 for each other creature you control with the same name as that creature.