how would a Muse of Light command that aspect? it makes sense if Light is luck, but the extended zodiac made Light seem like it's entirely knowledge-based.

I’ve talked about them before, but indeed, the Extended Zodiac makes no mention to luck, yet we do know Light = Luck, which opens the doors to Aspects relating to more stuff than the Canon Quiz told us if we look into it, they’re expansive and not quite finite after all.