According to Leo Akaba the purpose of these cards was to harness the natural energy of the planet to equal and counter the malicious aspects and energies of humans that metamorphosed Zarc into his fiendish draconic form.
Leo Akaba investigated a method to stop Zarc's fused form. By traveling the world and following the theory of Duel Monsters with souls while researching different natural environments, Leo was able to create four Spell Cards subtitled under the names "Flowers, Birds, Winds, and Moon" from the natural energy that he believed would be able to counter Zarc. Through analyzing and studying the desire of plants that are destroyed but sprout with the seasons and animals that endure winter to survive to spring he was able to fulfill his objective. The audacious desire to live that has manifested in the world for hundreds of thousands of years. This generated a robust energy that Leo hoped to utilize to halt the dark emotions and surpass Supreme King Dragon Zarc. However, when Leo had just finished creating the four cards, Ray stole the cards as she could not bear the thought of losing her father.
Leo gave chase to his daughter but she activated a card, destroying the surrounding buildings and blocking his way with rubble. Leo then took a different road and eventually saw Ray, confronting Zarc, as she activated the four cards, causing the related natural energy sources of flowers, birds, wind, and the moon to react and converge within Ray's body. The reaction of natural energies then created the Four Dimension Bracelets on Ray's right hand. The natural energy convergence then caused a reaction in both Ray and Zarc's bodies, and subsequently de-fused the Supreme King Dragon from his dragons as well as Ray's and Zarc's original bodies into four, creating their Dimensional counterparts and the Four Dimensions.
The Natural Energy Cards are the original forms of the Four Dimension Bracelets.
Each of the cards' names include the word "En".
Natural Energy Cards' playing style starts with the game having many Fusion, Synchro and Xyz Monsters in the GY or banished. When gathered, they're activated as quickly as all at once. After all of them are activated, which would have Fusion, Synchro and Xyz Monsters' Effect negated and them treated as Normal Monsters, they are destroyed with "En Flower" and would severely damage the opponent.