Injustice Gods Among Us-Killer Frost Prime Gameplay Elite VII

Killer Frost Prime is a versatile character, wielding one of the most dangerous debuffs to fight against and tricky basic and special attacks. She is definitely a "cool" card to have in your arsenal, and often a dragged-out slugfest to face.
She is known to be a guaranteed pull in the Ice Breaker Pack. However, obtaining her from a pack will not unlock her for direct promotions.

Strategy

Killer Frost Prime offers a lot to her team besides her powerful static debuff: she had a strong combo ender which is still decent today, and each of her special attacks has very useful effects without the normally associated damage penalty. She can be geared effectively with any of her attacks in mind.

Passive
"Best Served Cold" reduces the power generation of each member of the opponent's team by 50%. This seems to be done on an additive basis, meaning that a character equipped with the fully fused The Ibistick (which gives a 20% power generation increase when fully maxed out) but with no other power generation boosts will generate power at 70% the normal rate.

This effect stacks with the freezing effects that come on both of Killer Frost/Regime's specials (which also will reduce power generation by 50%), meaning that, without an effect increasing power generation, Prime Killer Frost can allow opponents' power generation to be frozen to absolutely 0%. It is not stated in her passive or in the description of the move, but Killer Frost/Prime's SP1 actually has the same freezing effects as those mentioned in her Regime counterpart's passive (see below in Special Attacks and Interactions). However, it appears in Online Battles, power can still be generated under those effects, albeit very slowly.

Her passive will work if she is on your team, regardless of being tagged in, out, or KO'ed.

Special Attacks
As mentioned above, her SP1 slows the opponent and further (additively) cuts their power generation by 50%. This effect cannot simply be blocked, and will pass the effect on to the next opponent if the last hit achieves a knockout. Without a further source of power generation, the opponent's power generation is zeroed.

Her SP2, meanwhile, is one of the only specials in the game to always be (partially) unblockable without any penalty or reliance on passive. Thus, many often geared her up to use this special if they can. Aside from that, it can be chained from her heavy basics, which can potentially make her whole SP2 unblockable.

Interactions
Please note that battles are highly situational: this section only mentions cards that have mechanics that, for any reason, are particularly effective with/against, or particularly ineffective against Killer Frost. Having a card that "counters" Killer Frost does not mean it is always a good choice.

Good With
Wonder Woman/600: Her passive gives Prime Killer Frost 30% more damage and power generation; with some gear, her entire team can be gaining power at about three times as fast as the enemy team - they won't be able to quit fast enough.

Killer Frost/Regime: 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's healing reduction. Indeed, Regime Killer Frost, 600 Wonder Woman and either one of Prime Killer Frost or Cassandra Cain Batgirl are common teams on multiplayer defense and are quite possibly the most frustrating opponents there could be.

Solomon Grundy/Earth 2: Solomon Grundy (and another Earth 2 teammate of choice) will cause the opponent to generate no power at all except due to gear or passive power boosts when teamed with Killer Frost.

Good Against
Killer Croc/Arkham: Killer Frost's power dampening will ensure that Croc cannot reach his specials to build up armor as much as he would otherwise. Additionally, with already the slowest movement speed in the game, Killer Frost's SP1 will absolutely cripple Killer Croc's ability to move at all.
Superman/Dawn of Justice: Killer Frost dampens power generation, thus making it harder for Superman to use his special attacks.
Superman/New 52: The reduced rate of power generation makes it extremely difficult for Superman to gain his unrinsible basic attack buffs.
Any other characters with special or super move dependent passives.

Abilities
Best Served Cold: Dampens all opponents power generation by 50%.

Gold

850/1,200

Promotion Cost 231,000

Challenge Mode, Challenge Booster Pack, Ice Breaker Pack, Special Challenge Booster Packs