Dragon , Red-Eyes Fusion , Predaplant Verte Anaconda ) in either the Main Deck or Side Deck, or using Muddy Mudragon to Special Summon Red-Eyes Dark Dragoon to complement their strategy
Building these decks requires a lot of estimation and educated guesses considering in pretty much every single case, one full on-screen duel is not nearly enough to show their entire deck
Deliberate Injury Gambit: Does this in their duel with Adrian, willing to take enormous, near fatal-damage that takes them down to 100 LP by crashing Grave Squirmer into Fog King, so as to stop the burn effect of Royal Sword via Grave Squirmer's destruction-floating effect
Legend of Blue Eyes White Dragon (2002) Complete Set Near Mint to Moderately Played - includes an official Konami Yu-Gi-Oh themed 180 card binder with anti slippockets
This Vanellope would be a great fit in a deck like that, but I'm not suspecting it to be any good, at least not yet
Harpies like to search the deck with Harpie Queen for Harpies Hunting Ground, with Hysteric Sign for Elegant Egotist, and for monsters with Harpie Harpist