Secret Lair x Arcane: Lands was the second part of the collaboration between Magic: The Gathering and Arcane, the animated series based on League of Legends. The five basic lands each featured a different iconic location from Piltover or Zaun, using scenes taken directly from the show to bring its world into Magic. The drop offered a cohesive way for Arcane fans to incorporate the series' distinctive settings into their decks or collections through a complete set of basic lands.
Given the rarity and limited information on some bonus cards, this may not be a complete list of all potential bonus cards available in this Secret Lair.
Summoner's Rift (Command Tower)
{T}: Add one mana of any color in your commander's color identity.
