Overview
Every enemy in the game has a 12.5% (1/8) chance to drop their respective 
Basic Card.
When 5 Basic Cards of one enemy type is collected, it can be upgraded to become 1 Elite Card of that enemy type. Having an Elite Card of an enemy type grants the player access to a skill of that enemy. When 5 Elite Cards are collected, they can be upgraded to 1 Super Card, which upgrades the previously granted skill, typically increasing 
Damage as well as 
SP costs.
Notes
Corrupted enemies do not have any higher of a chance to drop their respective Card, nor of higher rarity.- An Elite/Super Card can be obtained in any way to obtain the Skill it grants.
- Losing the Elite/Super Card in any way also removes the ability to equip the Skill it grants.
- Losing the Elite/Super Card in any way also removes the ability to equip the
Trivia
- Before dropping was disabled, players were able to drop Cards, which allowed for Skills to be removed.