Knowledge Vault [Legends] Guilds of Ravnica Guild Kit Set: Secret Lair Drop Series

Set: Secret Lair Drop Series Type: Instant Rarity: Rare Cost: {2}{U} If you control a commander

where X is the number of untapped lands they controlled at the beginning of this turn

Set: Duskmourn: House of Horror Promos Type: Land Rarity: Rare T:Add U

They built a refuge with their bear hands

Knowledge Vault [Legends] Guilds of Ravnica Guild Kit Set: Secret Lair Drop SeriesSet: Legends Type: Artifact Rarity: Rare Cost: {4} {2}, {T}: Exile the top card of your library face down. {0}: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards exiled with Knowledge Vault into their owner's hand. When Knowledge Vault leaves the battlefield, put all cards exiled with Knowledge Vault into their owner's graveyard.