Weevil Underwood's Decks

Weevil uses an Insect Deck. His strategies rely on cards such as "Insect Barrier" or "Cocoon of Evolution" to block opposing attacks while preparing to Summon his strongest cards, "Great Moth", "Perfectly Ultimate Great Moth", and "Insect Queen". Compared to other Duelists, Weevil uses few Magic and Trap Cards, the ones he does use acting to protect his insects or allowing him to swarm the field with them.

Duelist Kingdom
During Duelist Kingdom, Weevil's Deck focused on evolving "Larvae Moth" with "Cocoon of Evolution" and using Equip Magic Cards to power up his weaker Insects.

Battle City
During Battle City, Weevil utilized "Insect Barrier", "Parasite Paracide" and "Reckless Parasite" to prevent opposing monsters from attacking, having arranged for "Parasite Paracide" to be slipped into Joey's Deck without his knowledge so he could use it against him. He further focused on his new ace card, "Insect Queen". Oddly, while Seeker was looking up duelist's rarest cards, Great Moth was listed despite Weevil's rarest card being Insect Queen.

Waking the Dragons
When Weevil joined Dartz, he was given "The Seal of Orichalcos" and access to almost every card ever made. He used his strategy of turning his opponent's monsters to Insects to defend with "Insect Barrier", this time using "DNA Surgery". He also uses some burn cards, and cards that further exploit his strategy of turning his opponent's monsters into Insects.

Grand Championship
Weevil was only seen dueling once,attempting to infiltrate the Grand Championship but getting thrown out when he and Rex lost to Zigfried von Schroeder.