Lava Golem.
Naturally, few people in the world knew this monster better than Mr. Marik. But even Marik was generally used to being on the other side of the cage, not inside it.
In the original story, it was not Surface Marik who used Lava Golem, but his inner personality, Dark Marik.
However, by the time Dark Marik seized Surface Marik's body, he had already boarded the airship for the Battle City Top 8 Match. Although Dark Marik had modified the original Deck and replaced some cards, he was already on the ship at the time, so the number of cards he could swap was limited. Most of the Deck's foundation still consisted of Surface Marik's original cards.
And after the inner personality was eliminated, the Deck he had used remained behind. Naturally, the cards he had used subsequently became the property of the Surface Personality as well.
So Marik was certainly no stranger to Lava Golem-related tactics. One look at this setup, and he had already grasped what the opponent was trying to do.
The Submarineoid was responsible for attacking directly, while Lava Golem could not only consume his Tribute Monsters, but also steadily burn his Life Points every turn. The whole strategy was built around torment.
But that was not all.
"Next, at the instant Submarineoid is revived, I activate this card," Kira said. "Quick-Play Spell, Infernal Reckless Summon!
It can only be activated when a monster with 1500 or less ATK is Special Summoned to my Field. Special Summon as many cards with the same name as that monster as possible from my hand and Deck."
Marik's expression grew increasingly grave. "A monster with 1500 or less ATK... that Submarineoid?"
Kira said, "Indeed. Therefore, I Special Summon the other two Submarineoids back to the Field as well!"