Worms were a Deck Doma had enthusiastically gifted Kira back then. But Kira had never personally liked Reptile Type monsters much, so aside from occasionally including specific Worms when pulling off gimmicks, he had basically never used this Deck.
But now, paired with Professor Cobra's Venom strategy, it seemed to have some potential worth developing.
First of all, the Worm Deck had an extremely important boss monster: the twenty-sixth Worm, the ultimate life-form that was both the beginning and end of all Worms—Worm Zero.
This card required two or more Reptile Type monsters with "Worm" in their names as Fusion Materials, with no upper limit. Therefore, with "Future Fusion," the Worms could fuse straight from the Deck. With just this one card, he could easily Mill over twenty Worms from the Deck into the Graveyard in one go.
Whether it was Professor Cobra's Vennominon or Venom Serpent God, their ATK was entirely determined by the number of Reptile Type monsters in the Graveyard. The more Reptile Type monsters there were, the higher their ATK became.
So it was easy to imagine: Future Fusion could select Worm Zero from the Fusion Deck and send twenty or thirty Reptile Type monsters to the Graveyard at once. If Venom Serpent God was then summoned, it could easily become an ultimate monster with ten or twenty thousand ATK, unaffected by card effects and impossible to Banish, whose touch alone would trigger a three-turn Rule Victory countdown.
And even aside from using Worm Zero for a Mill Strategy, as a Reptile Type-themed Deck, the Worm archetype was far stronger than Professor Cobra's Salty Snake Venom series.
The Worm archetype itself had some powerful monsters, as well as quite a few small monsters with rather sinister Flip Effects. Even without its boss monster, its battle power