The Mystical theme is the third theme in the game and unlocked at rank 10. The cards in this theme are based off of the children's "mystic" personas. These are usually personas of mythical beasts, legendary figures, or people tied with certain religions (most prominently Christianity). Energy Staff is the only card not directly tied to one of these themes, but fits in line with the gameplay of this theme.
In gameplay, this theme focuses on sustaining battles through healing allied units and small advantages through energy manipulation.
Mystical currently has 27 playable cards.