I have every single card. All 354 of them.

Bahamut took me months. Promise's took me months of farming. Warrior of Light or Zidane didn't drop from the Gold Triad Pack for over year. The tournament ones took me over a year of doing tournaments to get. The city state leaders and Argath cards took a lot of tries. Thordan, Suzaku and Byakko took a lot of farming. Having to do all of the blue mage and hildibrand content took me time because I didn't want to rush it just for the cards. I couldn't find Lewena for over a year because they don't have a Triple Triad icon on them but eventually I spotted them.

Some of these have since been nerfed because cards were made a lot easier to win in matches.