Whim of Volrath [Tempest] Elf Knight sacrifice it unless you return

sacrifice it unless you return a non-Lair land you control to its owner's hand

Set: Kaladesh Inventions Type: Artifact Creature — Construct Rarity: Mythic Cost: {4}{U}{U} Flash

then that player chooses a card name

Set: Guilds of Ravnica Type: Land — Island Swamp Rarity: Rare ({T}: Add {U} or {B}

that player's life total becomes 20

Whim of Volrath [Tempest] Elf Knight sacrifice it unless you returnSet: Tempest Type: Instant Rarity: Rare Cost: {U} Buyback {2} (You may pay an additional {2} as you cast this spell. If you do, put this card into your hand as it resolves.) Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another until end of turn. (For example, you may change "nonred creature" to "nongreen creature" or "plainswalk" to "swampwalk.")