Your search for "Natural Tune RGBT-EN059" revealed the following:
Natural Tune - RGBT-EN059 - Common - 1st Edition from Raging Battle 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Select 1 face-up Level 4 or lower Normal Monster you control. It is treated as a Tuner monster...
Natural Tune - RGBT-EN059 - Common - Unlimited from Raging Battle Unlimited, available at 401 Games Canada. Rarity: Common Card Text:Select 1 face-up Level 4 or lower Normal Monster you control. It is treated as a Tuner monster while it...