Marianne, Lelouch's mother and one of the Emperor's many consorts. As well as being a lightning-fast fighter in a Knightmare (hence her nickname), she also had the power to stowaway in other people's subconscious when she died. I dunno how you represent that on a card, but getting the opportunity to play a card from each player's library seems as good as anything.

Originally I had her having flash and haste, but then there was basically nothing white on her card, and I think she should have white in her cost because she's a Britannian noble and a relatively caring one, and the colour red in this set is mostly associated with the rebels opposed to Britannia. So I swapped haste for lifelink.