My personal cube. Designed around the 37 Planeswalkers from War of the Spark, this cube's design goal is to provide an environment where all of these Planeswalkers could find some purpose and use. From Jaya doubling the pings from red triggered abilities to Vraska supporting a "Deathtouch" tribal, there should be a variety of little synergies available for each Planeswalker while also having flexible larger archetypes such as aggro, midrange, and control.

Not each color pair is strictly one intended strategy. Usually, for each color pair, there are 2 different strategies you can aim for, while there is still existing overlap.

Azorious: Blink, Control
Dimir: Mill, Artifacts
Rakdos: Aggro, Sacrifice
Gruul: Stompy, "Future Sight" type shenanigans (See Rhada and Frenzy)
Selesyna: Life Gain, Proliferate + Weenies
Orzhov: Life Gain, Reanimate
Golgari: Grindy Mid Range,
Simic: Ramp, Flash
Izzet: Non-Creature, Wizards
Boros: Aggro, Equipment

Here are just some examples of synergies found with each Planeswalker

Gideon - Use his static to crew the Weatherlight or Parhellion II
Teyo - Juggernaut can't be blocked by walls (yikes!)
The Wanderer - Ignore damage from Midnight Reaper or Command the Dreadhorde

Narset - Block the symmetrical draw from Folio of Fancies
Jace - Any Self-Mill
Kasmina - Pump the wizards with Adeliz

Davriel - Attack with Nyxathid
Ob Nixilis - Damage them with Folio of Fancies
Liliana - Pump zombies with Death Baron

Tibalt - sacrifice devils to Priest of Forgotten Gods
Chandra - Extend your Experimental Frenzy turns.
Jaya - Double the pings off of Cavalcade of Calamity
Sarkhan - 36 other Planeswalkers to turn into Dragons!

Jiang Yangu - Pay the activated ability of Golos, Tireless Pilgram
Vivien - Grow your Brineborn Cutthroat
Nissa - Have a ton of mana with Wilderness Reclamation
Arlinn - Pump the wolves from Nightpack Ambusher

Teferi - bounce and recast Oath of Kaya
Dovin - Stax your opponent with God-Pharaoh's Statue

Ashiok - Exile their Graveyard after Fall of the Thran
Tezzeret - Make a bunch of treasure tokens with Pitiless Plunderer

Angrath - Give your army lifelink with Dreadhorde Invasion

Domri - Smash face!
Samut - Scry to make more land drops with Radha

Huatli - Swing with Arboreal Grazer, take 3
Ajani - Set up Jiang Yangu's static

Sorin - Trigger Resplendent Angel
Kaya - Exile the Knight of Malice/Grace

Vraska - Deathtouch Tribal with Hooded Blightfang

Kiora - Untap Icy Manipulator
Tamiyo - Set up and search for Command the Dreadhorde

Saheeli - Get two triggers with Radical Idea
Ral - Copy a kicked Fight with Fire for the win

Nahiri - Give everyone Double Strike with Kwende, Pride of Femeref

Nicol Bolas - Fix up your mana base with Crumbling Necropolis so you can cast him!

Karn - Give your opponent a useless Wishclaw Talisman
Ugin - Free cantrip off of Guild Globe