Is luck in the domain of light players, or was that just Vriska, because I don't remember Rose doing anything that involved luck.

Luck and knowledge are the domain of all Light players. Aradia refers to Rose as a “knower of all fortune” because she can see the most fortuitous paths. Vriska is a Thief of Light that steals luck and information for herself. Aranea is a powerful Light player that has gathered knowledge over time and is prone to having certain 8r8ks in her favor.