This is a Shadow Game with upped stakes. Marik makes it so that "dark energy strings" connect Marik and Joey to each monster they summon. As a monster is destroyed or weakened, a corresponding amount of "damage" is dealt to the monster's owner. As it turns out, Joey is the only one whose physical energy is visibly affected, albeit not as badly as Marik had expected.
Featured Duel: Marik Ishtar vs. Joey Wheeler - Part 1
Turn 1: Yami Marik
Yami Marik draws "Gil Garth" and subsequently Normal Summons it (1800/1200) in Attack Position. He then Sets a card ("Dark Wall of Wind").
Turn 4: Joey Wheeler
Joey draws "Panther Warrior" and subsequently Normal Summons it (2000/1600) in Attack Position. He then Tributes a "Sheep Token" to allow "Panther Warrior" to attack. "Panther Warrior" attacks and destroys "Gil Garth" (Marik 4000 → 3800).
Turn 6: Joey Wheeler
Joey draws "Jinzo". He then Normal Summons "Rocket Warrior" (1500/1300) in Attack Position. Marik then activates his face-down "Hidden Soldiers" to Special Summon "Plasma Eel" (500/1200) in Attack Position since Joey Normal Summoned a monster. Yami Marik activates the effect of "Plasma Eel" to equip the latter to "Panther Warrior". "Rocket Warrior" attacks "Helpoemer". Due to the effect of "Rocket Warrior", it is not destroyed and Joey takes no Battle Damage. After damage calculation, the final effect of "Rocket Warrior" reduces the ATK of "Helpoemer" ATK by 500 until the end of the turn ("Helpoemer": 2000 → 1500/1400).
Joey then Tributes a "Sheep Token" to allow "Panther Warrior" to attack. "Panther Warrior" attacks and destroys "Helpoemer" (Marik 3800 → 3300). Since "Helpoemer" was sent to the Graveyard as a result of battle, Joey is now forced to randomly discard a card from his hand at the end of each of his Battle Phases so long as "Helpoemer" is in the Graveyard. At the end of the Battle Phase, the effect of "Helpoemer" forces Joey to discard "Jinzo".