Roost is one of the most pleasing words to say in the English language. Just try it.

This is (going to be) a 360 card vintage cube, that is built to be highly synergistic.
Power level: mh2 limited with better fixing and more cohesion.
The cards that I built the environment for are:

Drake Haven
Roost of Drakes
Fae Offering (may need more support)
The Rootwallas
Balduvian Horde
Juzam Djinn
Sliver Queen

Supported archetypes
Madness
Cycling
Artifacts
Reanimator
Control
Tempo
Tokens (Food, treasure etc)
1+1 counters

Supported Tribal synergies are
Sliver
Merfolk
Artifact
Elf (though less ramp than most cubes)
Zombie
Ninjas
Vampire
Human(?)

Other synergies
Landfall/Replacement

There are some broad tribal fillers that could support these archetypes (changelings, herald's horn etc).

I'm trying to decide on my snow support. Right now, I have 5 snow basics each of which allows the person to add 2 additional snow basics of any color.

Blue is most heavily weighted with white and red a little less supported. The mana is good, but slow and I expect most players to be 2-4 colors. 2 (or more) color cards are meant to be synergistically powerful but not stand alone (except for the ultimatums).

There are 2 learn cards in each color, and a pack of lessons will be drafted after the initial draft. Each drafted learn card gives access to 2 lessons in the supplemental draft. This will be a rotisserie draft with first pick going to the person with the most lessons.