For a list of every skill obtained from Cards, click here.
Overview
Every enemy in the game has a 12.5% (1/8) chance to drop their respective Basic Card. Buying boosts will raise that chance. Upgrading a Card to the next tier will always require 5 Cards from the previous tier.
The current tiers of Cards in the game are: Elite and Super.
Obtaining the Elite Card of a respective enemy will allow using their Skill, and can be enhanced further by obtaining the Super Card of that respective enemy.
A skill, when upgraded, typically increases Damage and 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.
Trivia
Before dropping was disabled, players were able to drop Cards, which allowed for skills to be removed.
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Cards, click here.
Damage and 
SP costs.
Corrupted enemies do not have any higher of a chance to drop their respective 
