Change is coming to the Crucible with the Mass Mutation set for the world’s only Unique Deck Game, KeyForge.
Over 200 brand-new cards now enter the cardpool in the game’s fourth set, and the mutative power of the dark æmber has changed many of them, creating strange and unknown versions of once-familiar creatures.
As gigantic creatures stretching across two cards lumber their way into battle, and House Sanctum makes its triumphant return, there has never been a more impactful time to leap into the fast-paced duels of KeyForge.

Each Mass Mutation Archon Deck contains a single, ready-to-play 36-card deck, bringing together three of the diverse Houses of the Crucible into a single deck—featuring its own mix of cards and unique from every other Archon Deck in existence.

KeyForge is a Unique Deck Game where two players take on the roles of mighty Archons racing to forge keys that unlock the hidden vaults of the Crucible, an artificial world where anything is possible. Battling with an incredible array of creatures, artifacts, and abilities in every one-of-a-kind deck, every game presents a new challenge and no two battles will ever be the same!