From Fiesta Wiki

Introduction

Cards were introduced on the 7th March 2012 in a four tier system, with "S" cards generally the rarest and "C" cards generally, but not always, the most common. MMORPG

Card Ranks

Pic	Type	Number of cards
	S-Rank	28
	A-Rank	57
	B-Rank	71
	C-Rank	97

Rewards

Unlocking certain cards can unlock titles and unlocking a certain number of cards from each tier can also unlock rewards.