Your Light team is "good enough" and doesn't necessarily need a Miracle ticket right now (especially if you have Diana). You're missing SSR Artemis and Michael. Michael would synergize with a Burst build with Hercules. With SSR Artemis instead of Raphael you could run Shingen and Sniper Shot for better damage output. Michael gets a very useful Awakening later. Until then there's no desperate need for her, and you could wait and see if you pull her from Gatcha.