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[End of Your Turn] [Once Per Turn] If [Cherubimon] or [X Antibody] is in this Digimon's digivolution cards, you may delete 1 of your opponent's level 4 or lower Digimon

SDY-007 - Gaia the Fierce Knight

P-181 P Option Parallel Rare Royal Base Color Green Black Form - Attribute - Type Royal Base DP - Cost 2 Digivolve Cost 1 - Digivolve Cost 2 - Upper Text [Security] [Your Turn] [Once Per Turn] When any of your Digimon would digivolve into a Digimon card with the [Royal Base] trait, reduce the digivolution cost by 1

References 2017-04-16 | YOT Hong Kong 2017 Main Event 2017-04-16 | YOT Hong Kong 2017 Asia Premier 2017-04-16 | 14th Yu-Gi-Oh

After stablising, you can simply break your own Mystic Mine by playing another field card