NOTE: This page contains information about a KeyForge set that has not yet been released. All information and images are subject to change prior to release.
Mass Mutation is the fourth KeyForge set, announced in a FFG live stream on January 30th, 2020, and scheduled for release in May 2020. It includes more than 250 new cards, for a total of 422 cards, making it the largest set yet. It is the first set completely designed by the FFG design team, with Richard Garfield involved only in an advisory role. House Sanctum is returning after being absent from Worlds Collide, but house Brobnar is rotated out for the first time. While Sanctum is returning to Mass Mutation, they will have a slightly different flavor from Sanctum in previous sets.
The core theme of the set is mutation, with many creatures returning in a mutated form and other abilities influencing or referring to Mutant creatures. This is the first KeyForge set to be based on a story; the mutations happen after two battling archons open a vault and discover blue-black Æmber. Many of the Mutants in the set will have artwork that feature the blue-black Æmber theme. At least one Anomaly from Worlds Collide appears in its original house in this set, but there will be no new Anomalies. Mass Mutation does not require any new tokens.
New in this set
Mass Mutation introduces the Enhance keyword. Unlike other keywords that are in effect during gameplay, the Enhance keyword modifies cards when the deck itself is generated, further driving the uniqueness of each deck. A card with the Enhance keyword will add bonus icons to any other card in the deck. These bonus icons can be Æmber, capture, damage, and draw. The Æmber icon provides an extra Æmber when the card is played, and the capture icon allows the player to capture onto a friendly creature. Damage icons deal one damage to a creature, and draw icons draw a card. These are resolved in the same step as the printed Æmber bonus on cards, and icons are resolved from top to bottom. Each card can have a maximum of 5 bonus icons, which includes normal Æmber bonuses on cards. There will be some way to determine which cards have bonus icons based on the deck list.
Mass Mutation also introduces gigantic creatures that are comprised of two cards that must be played together. Once in play, they are considered to be a single creature. For example, players can play a gigantic creature on their first turn even though they require two cards. There will be a way to search for these cards in one's deck, helping players tutor for them.
The set will feature Mutant versions of familiar cards. One example is the new card Rad Penny. This card is a newer, mutated version of the card Bad Penny from the first three sets. Instead of its original traits Human and Thief, Rad Penny has the traits Mutant and Thief along with new Play: and Destroyed: effects. The dark colored Æmber is visible in Rad Penny's pocket, and many other Mutant cards in the set will have similar visual cues to indicate that they are Mutants.
Special Rarity cards
Gigantic creatures will always appear as a pair of two cards. House Logos features a different Bot creature for each other house in the set.
The set will also feature Seven Sins cards, although they have yet to be spoiled.
Alongside standard Archon decks, Mass Mutation is available as a 2-player starter set and a deluxe deck that contains all keys and tokens needed for one player. This set will not have a Premium box for purchase.
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