To answer some questions:
- It's not reasonable to MLB SSRs at Normal difficulty. It can be done at Expert with excessive use of half-elixirs, but Ultimate is far more efficient.
- The best way to increase efficiency in Advents (and Raids) is to reach the point where you can auto-battle the highest difficulty fight that can be run repeatedly (Ultimate for Advents, Expert for Raid events). You'll need a near maxed team to do this reliably. Then just spam half-elixirs (for Advents) and eventually you can get all rewards without too much effort. You'll earn more materials for half-elixirs than you spend.
- In response to speculation about my Gatcha plans: I'm saving my jewels/tickets for Nike SSR. She's limited (can't be obtained with a Miracle Ticket), and also the odds of rolling an excellent water SSR kamihime will be highest (due to 3 very good ones being released in a span of 1 month). From a cost/benefit perspective, that's the optimal time to roll. I can always pick up Ryuuou and/or Cthulhu later with Miracle tickets, as needed.
As for Ragnarok, it was easy as expected with a Water team. Ultimate is also doable with auto-skill, which makes achieving max rewards in this event feasible. That's good, because I want MLB copies of the two SSRs and the two assault SR weapons.