1 Stella Lee, Wild Card 1 Eris, Roar of the Storm 1 Archmage Emeritus 1 Baral's Expertise 1 Tezzeret's Gambit 1 Midnight Clock 1 Haughty Djinn 1 Dig Through Time 1 Winged Boots 1 Talrand, Sky Summoner 1 Octavia, Living Thesis 1 Thunderclap Drake 1 Lock and Load 1 Forger's Foundry 1 Finale of Revelation 1 Curse of the Swine 1 Mizzix's Mastery 1 Chaos Warp 1 Crackling Spellslinger 1 Pyretic Charge 1 Smoldering Stagecoach 1 Elemental Eruption 1 Rousing Refrain 1 Cursed Mirror 1 Bloodthirsty Adversary 1 Finale of Promise 1 Arcane Bombardment 1 Niv-Mizzet, Parun 1 Kaza, Roil Chaser 1 Shark Typhoon 1 Galvanic Iteration 1 Epic Experiment 1 Veyran, Voice of Duality 1 Leyline Dowser 1 Exotic Orchard 1 Shivan Reef 1 Sulfur Falls 1 Frostboil Snarl 1 Temple of Epiphany 1 Cascade Bluffs 1 Ferrous Lake 1 Treasure Cruise 1 Preordain 1 Ponder 1 Murmuring Mystic 1 Deep Analysis 1 Radical Idea 1 Opt 1 Think Twice 1 Arcane Denial 1 Pteramander 1 Vandalblast 1 Pongify 1 Serum Visions 1 Faithless Looting 1 Big Score 1 Storm-Kiln Artist 1 Young Pyromancer 1 Electrostatic Field 1 Guttersnipe 1 Volcanic Torrent 1 Windfall 1 Goblin Electromancer 1 Third Path Iconoclast 1 Expressive Iteration 1 Arcane Signet 1 Izzet Signet 1 Sol Ring 1 Command Tower 1 Temple of the False God 1 Reliquary Tower 1 Izzet Boilerworks 1 Propaganda 14 Island 13 Mountain Quick Draw tokens 1 Bird Illusion // Elemental token 1 Ape // Shark token 1 Drake // Soldier (Urzan) token 1 Boar // Drake token 1 Elemental // Soldier (Urzan) token 1 Dragon Elemental // Bird Illusion token 1 Dragon Elemental // Treasure token 1 Bounty: Rissa "Blades" Lee // Bounty Rules token 1 Bounty: Sleepy Sovka // Bounty Rules token 1 Bounty: Miron Tillas Jr

Choose a commander you enjoy, define a clear strategy, add 7-10 win conditions, add the core components (draw, ramp, removal), build a 36-38 land mana base with color fixing, then playtest and tune the ratio
Then you get all of those cards to punch above their weight
In each bracket description, you'll also find guidance around four kinds of effects that can really impact games: two-card infinite combos, extra turns, mass land denial, and tutors (for things other than lands), noting where and how you should expect to see them
1 showcase or alternate-art card
The art for this promo is much more menacing than the base version, and it shows off the Sea Witch Queen title of the card so much better