The Card Cipher appears as a credit card-sized rectangle of plastic that shouldn't be able to contain what it does - its surface is dominated by a holographic Blockbuster logo that seems to watch you, the magnetic stripe runs with actual current, and your member number is etched in chrome that catches neon light. Around its edges, faint VHS tracking lines pulse like a heartbeat. Elite members see gold luminescence emanating from their stripe, Preferred get blue, and those about to be Suspended flicker with dying red.

The Card Cipher is both key and lock - it grants access to the survival arena while simultaneously encoding your elimination probability, making it the most powerful and dangerous object any player can possess. There's a growing underground of players who've discovered how to manipulate their Card Cipher through strategic attendance, and the Chaintrix has deployed 'card readers' at certain events to detect tampering.