The Joker/Insurgency

Insurgency Joker  can be seen as one of the "starter" gold cards, being a common drop from  Gold Booster Packs. While his base stats are one of the lowest in the game and his specials are slow and easily blocked, and that his special 2's bonus damage doesn't actually work and deals greatly reduced upfront damage (encouraging use of his  Super Move ), he is not without merits: he is readily available, and he has Joker's typical 4-hit heavy combo, which essentially gives him 1000 base damage in terms of basic attacks and allows him to gain power 1/3 faster than most other old characters using heavy combos. If all else fails, he works as an excellent throwaway character for tough nightmare challenge battles: upon being knocked out, his current opponent takes 40% of their maximum health as damage.

Basic Attacks
With the release of area 8, particularly the second last battle (the one that leads up to Superman/Blackest Night), as well as the nerf to Raven/Prime's passive (bosses do not lose % health when health swapping, but only absolute health according to Raven's health), he becomes very useful in blowing off massive amounts of health against the solo bosses, starting with Batman/Dawn of Justice (and unlike specials he cannot dodge Joker's passive) for instance, dealing over 300,000 damage (the boss card's damage is inaccurate and is about half of his real health). He can be coupled with The Joker/Prime (30% max health damage upon KO) to take off 70% the total health of any boss.

Countered By

 * Solomon Grundy/Prime ,Solomon Grundy/Regime, Doomsday/Containment: They can all afford to be at low health and withstand The Joker’s passive.
 * Raven/Teen Titans: Should her passive activate after knocking Joker out, she would recover from the damage he inflicts by gaining a large amount of health from the next opponent.
 * Doomsday/Prime: He is the perfect counter to Joker, knocking him out will make Doomsday's passive take priority over Joker's.

Abilities
Here are Joker's abilities.

Support Cards and Gear
Here are Joker's support cards and gear.

Trivia

 * Even if he did NOT deal any damage, upon being KO'd, the amount of health that the opponent lost from his passive will actually be counted as the total amount of damage that he dealt instead.
 * The same can be said for both Black Adam/Prime and Black Adam/Regime, if they did not deal any damage from attacking, but instead reflected back the damage from the attacker.
 * Both him and The Joker/Prime are the only ones with the exact same passive descriptions (although both reduce a different amount of health).
 * As of 2.15, his passive is bugged and can only trigger properly if knocked out with basic attacks or super moves. If knocked out with a special, no damage is dealt. However, in update 2.17, this was fixed.