Welcome to my cube. It's a 360 Unpowered Cube with this breakdown:

50 cards per color
30 multicolor cards (3 per guild)
40 colorless cards
40 nonbasic lands

To practice drafting, click the Playtest tab above. The default numbers for the Standard Draft are correct, so click Start Draft. Once finished, build a 40-card deck, leaving room for about 17 lands.

When drafting a cube, it's better to draft an archetype, not a color. In other words, not all cards of a color belong in the same deck. For example, some white cards fit well in a control deck, while others fit well in an aggro deck. Use the archetypes below to help you draft. Of course, these aren't all of the archetypes you could draft. You could draft a Control deck or a Go Wide deck.

Supported Archetypes

Control
Countermagic like Counterspell and Mana Drain
Removal like Swords to Plowshares and Fractured Identity
Card draw like Brainstorm and Fact or Fiction
Board wipes like Wrath of God and Day of Judgment
Planeswalkers like Jace, the Mind Sculptor and Teferi, Hero of Dominaria
Finishers like Consecrated Sphinx or Batterskull

Flicker
Phelia, Exuberant Shepherd
Restoration Angel
Flickerwisp
Parallax Wave
Mimic Vat
Aether Channeler
Reveillark
Venser, Shaper Savant
Jace, the Mind Sculptor
Cryptic Command
Mystic Confluence
Creatures with good enter the battlefield effects like Wall of Omens, Blade Splicer, Palace Jailer, Solitude, and Whirler Rogue

Reanimator
Reanimate
Animate Dead
Exhume
Necromancy
Entomb
Griselbrand
Archon of Cruelty
Elesh Norn, Grand Cenobite
Ulamog, the Ceaseless Hunger
Any other expensive, impactful creature
Discard outlets like Careful Study and Psychic Frog
Splash for Faithless Looting, Prismari Command, and Dack Fayden

Aristocrats
Blood Artist
Zulaport Cutthroat
Goblin Bombardment
Purphoros, God of the Forge
Judith, the Scourge Diva
Liliana of the Veil
Token producers like Young Pyromancer and Goblin Rabblemaster
Creatures that recur themselves like Gutterbones and Bloodghast

Ponza
Strip Mine
Wasteland
Wrenn and Six
Crucible of Worlds
Ramunap Excavator
Life from the Loam
Plow Under
Acidic Slime

Go Wide
Token producers like Elspeth, Knight-Errant, Monastery Mentor, Brimaz, King of Oreskos, Secure the Wastes, Deep Forest Hermit, Deranged Hermit, and Hornet Queen
Anthem effects like Gideon, Ally of Zendikar, Angel of Invention, Garruk Wildspeaker, Mirari's Wake, and Elesh Norn, Grand Cenobite
Payoffs like Craterhoof Behemoth
Flicker effects like Flickerwisp, Restoration Angel, and Parallax Wave
Mana dorks like Llanowar Elves and Birds of Paradise
Splash for Purphoros, God of the Forge and red token producers like Goblin Rabblemaster

Stax
Smokestack
Braids, Cabal Minion
Rankle, Master of Pranks
Tangle Wire
Winter Orb
Sundering Titan
Liliana of the Veil
Rishadan Port
Token producers like Ophiomancer
Creatures that recur themselves like Gravecrawler

Splinter Twin
Splinter Twin
Kiki-Jiki, Mirror Breaker
Pestermite
Deceiver Exarch
Zealous Conscripts
Imperial Recruiter
Splash for Restoration Angel and Recruiter of the Guard

Wildfire
Wildfire
Burning of Xinye
Mana rocks like Sol Ring and Grim Monolith
Planeswalkers like Koth of the Hammer and Chandra, Torch of Defiance
Creatures with five toughness or more like Thundermaw Hellkite and Inferno Titan
Countermagic like Counterspell and Mana Drain

Sneak and Show
Sneak Attack
Show and Tell
Through the Breach
Emrakul, The Aeons Torn
Ulamog, the Ceaseless Hunger
Any other expensive, impactful creatures
Countermagic like Counterspell and Mana Drain

Tinker
Tinker
Goblin Welder
Faithless Looting
Careful Study
Wurmcoil Engine
Triplicate Titan
Myr Battlesphere
Batterskull
Inexpensive artifacts for Tinker
Discard outlets for Welder
Mana rocks like Grim Monolith to cast your finisher outright

Rec/Sur
Recurring Nightmare
Survival of the Fittest
Fauna Shaman
Living Death
Mana dorks like Birds of Paradise to pay for multiple activations
Utility creatures like Reclamation Sage and Cankerbloom
Expensive, impactful creatures to reanimate

The Rock
Value creatures like Eternal Witness, Ravenous Chupacabra, Solemn Simulacrum, Scavenging Ooze, Deep Forest Hermit, Deranged Hermit and Thragtusk
Board wipes like Toxic Deluge and Damnation
Mana dorks
Hand disruption like Thoughtseize and Hymn to Tourach
Efficient removal like Go for the Throat and Assassin's Trophy
Creatures like Tarmogoyf, Grave Titan, and Liliana of the Veil

Weenie
One-drop creatures with two power like Ragavan, Nimble Pilferer, Goblin Guide and Isamaru, Hound of Konda
Powerful two-drop creatures like Porcelain Legionnaire, Young Pyromancer, and Stoneforge Mystic
Equipment like Umezawa's Jitte and Sword of Fire and Ice
Top-end creatures like Hellrider and Hero of Bladehold
Burn and removal like Lightning Bolt and Path to Exile
Splashy spells like Armageddon, Sulfuric Vortex, and Winter Orb

Channel/Natural Order
Channel
Natural Order
Wurmcoil Engine
Triplicate Titan
Myr Battlesphere
Karn Liberated
Ugin, the Spirit Dragon
Woodfall Primus
Dragonlord Atarka
Mana dorks for Natural Order

Oath
Oath of Druids
Selvala's Stampede
The only creatures in your deck should be three or four impactful creatures like Emrakul, The Aeons Torn or Ulamog, the Ceaseless Hunger
Manlands like Mutavault and Mishra's Factory
Splash for card draw, countermagic, and bounce, such as Cryptic Command
Splash for tutors and creature removal
Planeswalkers in your colors

I use these sources to update my cube:
BlackWaltz3's Cube Power Ranking: https://www.mtgsalvation.com/forums/the-game/the-cube-forum/cube-card-and-archetype/812617-ranking-project-2019-white-results

wtwlf123's Set (P)reviews: https://www.mtgsalvation.com/forums/the-game/the-cube-forum/articles-podcasts-and-guides/822969-set-p-review-my-top-20-adventures-in-the-forgotten

SteveMan's Hot Takes: https://cubecobra.com/content/article/60da46193c597b1048878039

Cards to replace with older versions:
Rishadan Port
Mana Crypt
Mana Drain