Ali Baba

• WWizards of the Coast2004-10-04
  Official Ruling
  This ability may be used to tap more than one Wall per turn if you have enough mana, since tapping isn't part of the activation cost.
• WWizards of the Coast2004-10-04
  Official Ruling
  The ability may tap walls even when Ali Baba is tapped or entered that turn, since the activation cost doesn't include .

Rulings via Scryfall