Sovereign's Realm (CN2) from Conspiracy: Take the Crown, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Normal
• Artist: Daniel Ljunggren
• Card Text:
  (Start the game with this conspiracy face up in the command zone.)
  Your deck can't have basic land cards and your starting hand size is five.
  Exile a card from your hand: This turn, you may play basic land cards from outside the game.
  Basic lands you control have "T: Add one mana of any color to your mana pool."