Talk:2017 New Year Lucky Bag Summoning Campaign/@comment-36948134-20190101010859/@comment-33844581-20190101015215

Caster would be the safe bet all 3 casters fill different roles than the ones you're using. Ideally you should hope for Waver or Tamamo though. However, I highly recommend choosing a based on what characters you like/want not need.

Waver= The best universally useful support servant in the game period. It's a common misconception but Waver and Merlin very different roles. Merlin is the best Buster support and probably the best support for challenge quests. While Waber is the best farming support and is useful in almost every situation just because of his NP charge ability alone. Since 90% of FGO is farming he will always be useful.

Tamamo= The Arts support servant. Xuanzan= the worst out of the 3 but she's one of the few and ST NP SSR casters.