The smaller-than-normal green Kirby represents Tama, a small, floating character with a green color scheme.
The Clear Kirby minion starting off with a Killing Edge represents Tama's sword spirit form, who appears as a floating sword.
The stage represents the forests of Hinoe Island, the Isle of Demons, which serves as the main setting of Sakuna: Of Rice and Ruin.
The music track represents the musical theme of The Mysterious Murasame Castle, which features a traditional Japanese aesthetic similar to Sakuna: Of Rice and Ruin.
Other trivia:
This spirit's Support type references Tama's role in Sakuna: Of Rice and Ruin as Sakuna's guide and guardian.
This spirit's Transformation Duration ↑ ability references how Tama is a sword spirit with the ability to transform into a sword.