Oh Yeah! Mario Time!
Oh Yeah! Mario Time! (みんなのヒーロー！ マリオシリーズ大集合) is a Spirit Board event focused on Spirits from the Mario series. It ran from 7 a.m. on December 28, 2018 to 7 a.m. on January 2, 2019 (UTC). During the event, defeating Spirits on the Spirit Board which are part of the event awarded more gold than usual.
The three periodically appearing spirits for this event were exclusive to it at the time; from version 2.0.0 onward, these Spirits appear in the shop and on the Spirit Board like most other Spirits.
Periodically appearing spirits
Randomly appearing spirits