Musing about what colours get different effects, I realised that UBG are the three card-draw colours, but there hasn't really been an exploration of what would happen if the three of them worked together. I think "draw three cards" would be too good for (cf Consult the Necrosages), but I think the extra colour requirement means this is okay.

Difficult to come up with a flavour that all three would be happy with, but "knowledge" is vague enough that it's probably fine.