Personal take on a 360 "Legacy+" cube.

Designed to enable 10 distinct dual color identities, while still allowing bold dashes in 3-4 colors, all the time with a focus on synergies.

Gold cards act as post-signs to guide players and are generally pay-offs, but none is too strong on its own.

Since the cube revolves so much on builds and synergies, it is best drafted in ways that allow players to "see" more cards than less, to find the pieces they need.

UW: Artifacts matter (control/combo)
UR: Spells matter
UB: Discard (and GY) matters
UG: Combos (turns, ramp, mana etc.)
RW: Artifacts matter (aggro/value)
RB: Sacrifice matters
RG: Lands matter
WG: Enchantments matter
WB: life (gain) matters
BG: Graveyard matters

Some additional things that can be done outside of those 10 archetypes:

Oath of the druids / sneak attack / kiki jikki / palinchron / Valakut / Aluren / Intruder Alarm / Jeskai Ascendancy / Grixis storm (Aether reservoir/sentinel tower) / Mono R (with a hint of goblins) / Gx glimpse combos / Ux infinite turns etc.,

To make space for all these synergies and encourage non-linear deck building, lots of usual cube staples are absent (no Jace, no Thragtusk, no Ragavan, no scarab-god etc...). If a card is very good in any deck that plays the color, then odds are it won't be in my cube.

Fixing is relatively strong (fetch+shock+dual+4 city of brass-like), so if you want to go off-rail and do 3+ colors that's also an option, but synergies will be the reason you do it: Omnath 4c, Muldrotha, jeskai ascendancy, infinite sacrifice (RBG), Golos... No 4c good-stuff.dec should be doable.

I limit fatties a lot, and limit Wraths as well. This is to encourage more interaction. For example, Damnation got cut, and tinker won't be able to get you a triplicate titan. However, you can get an equally back-breaking Memory Jar, a sentinel tower, a KCI etc.

This cube does try to do many things, taking liberal inspiration from Caleb Gannon's Powered Synergy Cube, but reduced from 540 to 360, and without P9.

Add the fact I get way less real life testing than I'd like, and this means the cube is bound to not be perfectly balanced. I consider it on an ever-going (doomed to fail) quest of self-balancing. I welcome feedback if you ever try it!

Last, a note on "Power": I avoid P9 as these cards -imo- feel like they singlehandedly break what Magic's "balancing" can be considered. I am very happy with broken things if you intentionally build them, and also happy with the feeling of getting lucky with a great pull, akin to limited when you pull a broken mythic. This is why Tolarian Academy, Memory Jar, Time Spiral are in. They will win you many games, but you still have to do some work on the side, if only getting to 5 and 6 mana and having a follow-up. Ancestral Recall, Time Walk, fast mana moxen... much less work required.