1910 saw the introduction of the Rider-Waite tarot which was considered as revoloutionary, the Thoth came out about 35 years later and I think it was the next big step for all concerned with this divinatory technique. Not only is the deck supplemented with the Book of Thoth, and Crowley's Qabalistic magnum opus 777, it is artistically superb. Crowley is generally considered, even by his detractors, as the great Magical polymath of the 20th century. This tarot blends all of his Qabalistic, astrological, Hebrew, Thelemic and ceremonial concepts. When you see that Lady Harris was one of the main benefactors of the the last will and testament of Crowley you will understand the profound friendship they shared. This deck took five years to complete and several of the cards were repainted many times to satisfy Crowley's obsession with perfection. The Major Arcana is the best I know of, as are the deacons; and even though the Minor Arcana is lacking in the 'story telling' that is shown in the Rider-Waite it still excercises fascination. This deck is a must for all Thelemites and anyone serious about the Tarot. It simply cannot be ignored. Shuffle with care.