Once you have picked a dungeon, you enter the upper most layer and trigger that ability
Will is not mandatory as such, but it could win you games at the right moment
It's theoretically possible that, if you were to weigh literally thousands of packs to choose your heavy favorites, and bought hundreds of them, you might get a slightly higher pull rate of rare cards than if you bought the same number of random packs - but I don't recommend it, for two main reasons: Most game stores don't permit you to weigh individual booster packs before buying them - mostly because it takes a long time and holds up the line
For those interested, the team lists the following as their greatest influences: the films of Hayao Miyazaki, especially Spirited Away and Princess Mononoke the Onimusha video-game series the Ninja Scroll anime the Inu Yasha anime It quickly became apparent that a common theme of Japanese mythology was transformation
10 Lingering Souls Many of the cards on this list are best used in the Commander format, a slow and diverse format that has many ways to support tokens