Rarity matters too
Complete all Beginner Missions
While the original Base Set printing can be had for a relative pittance (sub-$2 per PriceCharting), the fireworks reverse holo version is worth over $200

Deck 2: Kiryu Kyosuke Style Infernity Deck 3 Infernity Archfiend 1 Infernity Patriarch 2 Infernity Necromancer 3 Infernity Beetle 1 Infernity Mirage 1 Infernity Avenger 2 Dark Grepher 1 Armaggedon Knight 2 Stygian Street Patrol 1 Supreme King Dragon Darkwurm 1 Supreme King Dragon Zero 1 Destrudo the Lost Dragons Frisson 1 Archfiend Heiress 1 Raviel, Lord of Phantasms Shimmering Scraper 1 Chaos Summoning Beast 1 Dark Beckoning Beast 1 Dragon Ravine 1 Infernity Launcher 1 Reinforcement of the Army 1 Foolish Burial 1 Monster Reborn 2 Void Apocalypse 3 Downbeat 3 Opening of the Spirit Gates 2 Infernity Barrier 2 Infernity Break 1 Elder Entity Ntss 1 Primathmech Alembertian 1 Number 60: Dugares the Timeless 1 PSY-Framelord Omega 1 Trishula, Dragon of the Ice Barrier 1 Hundred Eyes Dragon 1 Void Ogre Dragon 1 Apollousa, Bow of the Goddess 1 Crystron Halqifibrax 1 Saryuja Skull Dread 1 Curious, the Lightsworn Dominion 1 Knightmare Phoenix 1 Knightmare Unicorn 1 Knightmare Cerberus Summary Notes: Infernity Archfiend who can be Special Summoned if your hand is 0 works quite well in tandem with be Downbeat and Supreme King Dragon Darkwurm

(2019-06-14) If the value chosen for X is 0, Unbound Flourishing will double the value to 0 for permanent spells, and copy other spells and abilities
This is your boss monster, arguably one of the most powerful in the game, and it does a lot for your deck, oftentimes winning you the game on its own via OTKs