Perilous Vault (Retro Schematic) (Serialized) [The Brothers' War Retro Artifacts] Halfling Horror where X is the number

where X is the number of planeswalkers you control

but the dimensions make no sense

Set: Jumpstart 2022 Type: Enchantment — Aura Rarity: Uncommon Cost: {1}{G} Enchant land

Set: World Championships 2006 Type: Fire Rarity: Ultra Rare Retreat cost: Colorless

Set: Phyrexia: All Will Be One Prerelease Promos Type: Legendary Planeswalker — Vraska Rarity: Mythic Cost: {4}{B}{B/P} Compleated ({B/P} can be paid with {B}

Perilous Vault (Retro Schematic) (Serialized) [The Brothers' War Retro Artifacts] Halfling Horror where X is the numberSet: The Brothers' War Retro Artifacts Type: Artifact Rarity: Mythic Cost: {4} {5}, {T}, Exile Perilous Vault: Exile all nonland permanents. "As the years passed, Urza turned his focus from the Thran to worlds beyond his own, seeking any spell or technology that might break the Phyrexian scourge." *Urza: From Prodigy to Planeswalker*