"loses all abilities" is sufficient. Losing all text would be retarded because isn't that equal to a piece of cardboard with some art? It wouldn't even have a card type.
Also out of curiosity, how did you do flavor/mechanics tie-in for this one, I didn't follow geass, so, well.
Assuming the geass effect is something of an enchantment, might I suggest him destroying any enchantments on creatures that engage him in combat, though that would be very un-red.