Darksteel Citadel [Commander 2014] SWSH171 OR if this card was

OR if this card was put into play by the effect of "Masked Beast Des Gardius"

Set: Sword & Shield: Fusion Strike Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Set: Speed Duel: Trials of the Kingdom Card type: Normal Trap Rarity: Common If this Set card in its owner's control has left the field because of an opponent's effect

Set: Classic Sixth Edition Type: Enchantment — Aura Rarity: Rare Cost: {W} Enchant Wall

Set: The New Challengers Card type: Continuous Trap Rarity: Rare If this card is sent to the Graveyard: Add 1 "Naturia" card from your Deck to your hand

Darksteel Citadel [Commander 2014] SWSH171 OR if this card wasSet: Commander 2014 Type: Artifact Land Rarity: Uncommon Indestructible {T}: Add {C}. Structures built from darksteel yield to neither assault nor age.