Mountain (1366) [Secret Lair Drop Series] 67 you may change "swampwalk" to

you may change "swampwalk" to "plainswalk

or Treasure token

that player discards a card and you untap all lands you control

Set: The Dark Type: Artifact Rarity: Uncommon Cost: {2} {T}: Add one mana of any color that a land an opponent controls could produce

Sacrifice Glen Elendra Archmage: Counter target noncreature spell

Mountain (1366) [Secret Lair Drop Series] 67 you may change "swampwalk" toSet: Secret Lair Drop Series Type: Basic Land Mountain Rarity: Rare ({T}: Add {R}.) 9. One day, the day will find its furthest limit, the place beyond which no days are imagined: a place long sealed away, lost within the endless mountain range. One day, the night will find this place, and breach it.