Stab Wound
The pitch itself barely needed a pitch meeting: take the actual Duel Monsters card game, cram in over a thousand cards, and let the DSs two screens do what a real card table always wished it could, which is render your monsters in flashy 3D up top while the actual decision-making, deck construction, knowing what a Trap Card does, happens down on the touchscreen below

Ambush Viper Anaconda Ankle Biter Archers of Qarsi Bamboo Grove Archer Blight Mamba Boa Constrictor Bushmaster, Coiled Henchman Chishiro, the Shattered Blade Coiling Oracle Coiling Stalker Death-Hood Cobra Devotee of Strength Dread Linnorm Dune Diviner Fanatic of Rhonas Fang of Shigeki Fangkeeper's Familiar Feiyi Snake Floral Evoker Glass Asp Harrier Naga Heir of the Ancient Fang Hexdrinker Honored Hydra Hooded Brawler Hooded Hydra Hornet Cobra Ice-Fang Coatl Ikra Shidiqi, the Usurper Imoti, Celebrant of Bounty Jewel-Eyed Cobra Kadena, Slinking Sorcerer Kaseto, Orochi Archmage Kashi-Tribe Elite Kashi-Tribe Reaver Kashi-Tribe Warriors Kirin-Touched Orochi Krosan Constrictor Lasyd Prowler Lonis, Cryptozoologist Lonis, Genetics Expert Lorescale Coatl Lotus Cobra Marsh Boa Marsh Viper Matsu-Tribe Birdstalker Matsu-Tribe Decoy Matsu-Tribe Sniper Mire Boa Mold Adder Moss Viper Mystic Snake Nafs Asp Naga Vitalist Nemesis of Mortals Nessian Asp Noose Constrictor Oasis Ritualist Ohran Frostfang Ohran Viper Orochi Eggwatcher Orochi Leafcaller Orochi Merge-Keeper Orochi Ranger Orochi Sustainer Patagia Viper Prowling Serpopard Rampaging Aetherhood Ramunap Excavator Ramunap Hydra River Boa

Gyarados ex can be obtained from Wisdom of Sea and Sky: Lugia pack in the Wisdom of Sea and Sky set
If you put it in your deck, pray that it comes in your opening hand
In this deck, well easily hit at least one big Angel and a land