Thread:Shikifan/@comment-29427540-20180524160957/@comment-27971189-20180526174110

Its hard to guess as it still only two compare to Xmas that we already got three examples, and the decision seems to be different too for each year.

Scathach is obviously popular during 2016. No doubt. However instead of Ishtar, its Raikou (and Shuten), who actually the most popular during 2017.

If there's pattern close enough to notice, IMO its Lancer -> Assassin; Archer -> Rider; Rider is weak against Assassin just like how Archer weak to Lancer.

Based on that, my guess, next one is a Saber who became a Caster-- but that would be Nero? Maybe vice-versa?