Errata
From Archon Arcana - The KeyForge Wiki
This section contains the official errata that have been made to individual cards in KeyForge. Errata overrides the printed information on the card it applies to.
Auto-Legionary
Should read: Action: Put Auto-Legionary on a flank of your battleline. While in the battleline, it is considered a creature with 5 power and may be used as if it belonged to the active house.
Bait and Switch
Should read: Play: If your opponent has more 
than you, steal 1 . Repeat the preceding effect if your opponent still has more than you.
than you, steal 1 . Repeat the preceding effect if your opponent still has more than you.Biomatrix Backup
Should read: This creature gains, ”Destroyed: Put this creature into its owner’s archives.”
Custom Virus
Should read: Omni: Destroy Custom Virus. You may purge a creature from your hand. If you do, destroy each creature that shares a trait with the purged creature."
Drummernaut
Should read: Play/Fight/Reap: Return another friendly Giant creature to your hand.
Experimental Therapy
Should read: This creature may be used as if it belonged to the active house.
Play: Stun and exhaust this creature.
Incubation Chamber
Should read: Omni: You may reveal a Mars creature from your hand. If you do, archive it.
Keyforgery
Should read: When your opponent would forge a key on their turn, that player names a house. Reveal a random card from your hand. If that card is not of the named house, destroy Keyforgery and they do not forge that key (no is spent).
is spent).Library Access
Should read: Play: For the remainder of the turn, each time you play another card, draw a card. Purge Library Access.
Life for a Life
Should read: Play: Sacrifice a creature. If you do, deal 6 
to a creature.
to a creature.Magda the Rat
Should read: Elusive.
Play: Steal 2 . If Magda the Rat leaves play, your opponent steals 2 .
Pain Reaction
Should read: Play: Deal 2 to an enemy creature. If this damage destroys that creature, deal 2 to each of that creature’s neighbors after it leaves play.
to an enemy creature. If this damage destroys that creature, deal 2 to each of that creature’s neighbors after it leaves play.Tendrils of Pain
Should read: Play: Deal 1 to each creature. Deal 4 instead if your opponent forged a key on their previous turn.
to each creature. Deal 4 instead if your opponent forged a key on their previous turn.Yzphyz Knowdrone
Should read: Play: Archive a card. You may purge an archived card. If you do, stun a creature.
—Official rules v1.8 March 2021