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Card Text 2 [Inherited Effect] Blocker (At blocker timing, by suspending this Digimon, it becomes the attack target.) BT17-067 C Digimon Lv.5 DexDoruGreymon Color Purple Black Cost 8 DP 8000 Digivolve Cost 1 PurpleBlack 4 from Lv.4 Form Ultimate Attribute Virus Type Undead/X Antibody/SoC Card Text 1 [Special Digivolution Condition] [Digivolve] [DoruGreymon]: Cost 1 [Effect] [Trash] [All Turns] When one of your [DoruGreymon] would be deleted, by digivolving it into this card without paying the cost, prevent that deletion

2 Abyss Dweller Survived The Zexal Era At the end of every Yu-Gi-Oh

So things like the Digivolution tree found on each card's page would automatically mingle the 2 versions

structure decks in the history of the trading card game

Straight off the bat, we see the game being played - the player has a bunch of cards in their hand reminiscent of the pre-existing physical card game

New game mechanic, Dual Cards arrive