Great Tarot: the most difficult card game of all times?

About Great Tarot, from BoardGameGeek:

A trick-taking tarot card game that mixes the tradition of a historical deck and the innovation of a Bridge-inspired bidding system. Bid the perfect contract with your partner and play your cards to win points and tricks. Be aware of the special properties of cards like the Bagatto, the Fool and the World. A deep but fast-paced card game. -description from the designer