Killer Frost/Regime

Regime Killer Frost can be unlocked through Challenge Mode. Otherwise, she could be randomly obtained from Challenge Booster Packs or the Ice Breaker Pack, but neither will not unlock her for direct promotions.

Strategy
Killer Frost Regime is a great character with an extremely beneficial passive to one's team. She reduces enemy healing to a tenth, and her specials slow down and weaken her opponents. With Killer Frost, you're all about power so you can spam her specials and slow your opponents down. The only way to escape is to tag out. A good perk is also her high amount of health.

Her extreme healing reduction for the entire opposing team (regardless of whether she is tagged in or knocked out) forces them to walk on thin ice as any mistake would be almost impossible to recover from, while her high health means she can easily recover large amounts of health.

Her passive does not work against the Regeneration handicap or the regeneration effects of LexCorp Gauntlets V2 and the full Fourth World Set's effect, making them excellent counters to her. It also does not affect effects that sets a character's health at a certain level instead of just healing, such as Solomon Grundy/Prime's passive.

Good with:

 * Wonder Woman/600: Her passive gives Regime Killer Frost 30% more damage and power generation, allowing her to get to and utilize her special 1 quicker and stronger.
 * Batgirl/Cassandra Cain: Cassandra can easily inflict heavy damage on targets with high health, and Regime Killer Frost severely punishes characters at lower health as it is almost impossible to heal back, making them a very unforgiving combination.
 * Killer Frost/Prime: The pair of suffocating team-wide debuffs are simply an immense pain to fight against. Prime Killer Frost's s2 in particular is a large amount of unblockable damage that is just not recoverable against Regime Killer Frost. Indeed, Regime Killer Frost, 600 Wonder Woman and either one of Prime Killer Frost or Cassandra Cain Batgirl are common teams on multiplayer defence and are quite possibly the most frustrating opponents there could be.

Good against:

 * Harley Quinn, Doomsday/Prime, Wonder Woman/Dawn of Justice, etc.: Regime Killer Frost severely hinders any card that heals for a significant amount.

Countered by:

 * Raven/Prime, Doomsday/Containment, Cyborg/Teen Titans, Batman/Arkham Origins, Batman/Arkham Knight: Their passives are unaffected by Regime Killer Frost's passive.

Abilities
Here are Killer Frost's abilities.

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

Trivia

 * Regime Killer Frost has suffered from multiple bugs. At release, game crashes occurred while attempting to load her card. She can be used in silver and bronze only challenge battles despite being gold. Her specials completely stopped power generation instead of slowing by 50%. All of them have since been fixed.