Extraplanar Lens is a mythic Artifact card from Commander Masters (CMM), collector number 381. Current market price: $14.31 (foil $12.94), TCGplayer market prices via Scryfall.
Imprint — When this artifact enters, you may exile target land you control. Whenever a land with the same name as the exiled card is tapped for mana, its controller adds one mana of any type that land produced.