Storm Cauldron

• WWizards of the Coast2004-10-04
  Official Ruling
  Having multiples of these on the battlefield means you can play an additional land for each one.
• WWizards of the Coast2004-10-04
  Official Ruling
  If a land is tapped for mana and sacrificed all in one action, it goes to the graveyard before the Cauldron can return it to the player’s hand.
• WWizards of the Coast2004-10-04
  Official Ruling
  If a land is tapped for mana, it is returned to its owner’s hand as a triggered ability.

Rulings via Scryfall