Gained from Monsters, or when Monsters are turned into Cards, Monster Cards are the easiest to come by. I've found, that you need to strike a monster once or twice, before attempting a Card Transform. Bosses and Rare Cards cannot be attained by the Card Ability. The cards are set up with numeral notations, which denote power levels, a number per side, the higher the number, the stronger the side. Most Cards however, have one to three high sides, and a low side. Call it a balance of power, you may be able to best a card on one side, but be ready to have that strong card taken if you leave a weak side open to your opponent. I've spent more time with the Triple Triad portion, than the actual Quest, and lost more Cards than I care to think about. Just remember to save your game before you start playing with high/rare Cards, it will save you both time and money...time for playing to get your Cards back, and money from throwing your controller against the wall when you lose.

Card Example:

Card Numbering ranging from 1-10, the 10 being an A