Advanced d20 Magic introduces a new spellcasting system called Dynamic Spellcasting to the d20 System. Dynamic Spellcasting is an alternative system to the standard "Vancian" System that was based on the magic system in Jack Vance's Dying Earth series. Instead of memorizing and preparing spells, a spellcaster can cast any spell he or she knows as a standard action without any special ingredients or other actions. In effect, a spellcaster can cast any spell he or she knows as often as she desires.