{T}: Add one mana of any color. Spend this mana only to cast a creature spell.
Mana produced by Ancient Ziggurat can be spent on any part of a creature spell’s total cost. This includes additional costs (such as kicker) and alternative costs (such as evoke or Worldheart Phoenix’s alternative cost).
Mana produced by Ancient Ziggurat can’t be spent on activated abilities that put a creature card directly onto the battlefield, such as unearth or ninjutsu.