See rule 701.46, Venture into the Dungeon. 309.2a If a player ventures into the dungeon while they dont own a dungeon card in the command zone, they choose a dungeon card they own from outside the game and put it into the command zone
This deck was incredibly frustrating to play against because it forced the opponent to discard numerous cards throughout the turn by looping combo material, and one card that made this significantly easier to do was Number 60: Dugares the Timeless
After [All Turns][Once Per Turn] When an opponent's Digimon is deleted, you may unsuspend this Digimon
(Quick Effect): You can detach 1 material from this card, then target 1 face-up monster you control
This is most evident in the mana symbols, where the rosette pattern was once distinctly visible behind the black symbols
John Deck: Anger Prizes: 4 Booster Pack: Evolution (x2) John is a difficult opponent, and he uses of mix of Colorless, Fighting, and Fire Pokemon, which makes things even worse