Serendib Efreet (Creature) So good that it was banned along with Juggernaut and Kird Ape in Extended since the inception of the format
Stand-Up 1-card starter (+2 card cost) 4 interruptions: Crimson Dragon, Abyss, Dis Pater, Little Knight Hand cost 3 cards (2 card cost) A pattern to access the aforementioned Fiendsmith gimmick by gathering 2 Effect Monsters
destroy this card, and if you do, Special Summon 2 "Meklord Army" monsters from your Deck in Defense Position, except "Meklord Army Deployer Obbligato", also you cannot Special Summon monsters for the rest of this turn, except Machine monsters
Using Polymerization and Proxy F Magician isn't difficult
I like to conceptualize all of the enchantments that were casting to draw cards as the decks inputs and cards like Sigil of the Empty Throne and Archon of Suns Grace as outputs
Normally the best land or cycle hits #1 in my set review so something really strong must be hitting higher than this at the 11 spot