So it seems like the mechanical factions are starting to coalesce a little bit. Artifacts have the relictrip thing going on, spells have some mechanic that's being voted on soon, enchantments have the posthumans and some kind of religion angle, and creatures have the viashino "enter the battlefield every turn" thing going on. But I still have no idea what a lands deck would look like. Make a green common that says something about the flavor and the mechanics of that faction.

Cherish the Fruit --
Enchantment - Aura (C)

Enchant land
Enchanted land has, ": You gain X life, where X is the number of enchantments you control."

==xx==

As a general theme, it would be hospitality.

Creature - yeti shaman
: Target forest you control becomes a 2/2 yeti spirit creature until end of turn. Activate this ability only once per turn.
5/4

As a general theme it would be smash people with your lands

Bearer of a Lotus Seed
Creature - Elemental
When ~ enters the battlefield, target land has ": add one mana of any color to your mana pool in addition to whatever mana this land could otherwise produce"
2/5

Cancane Shepard
Creature - Human Druid
Whenever a land enters the battlefield under your control, you may gain one life.
1/2
On the sunside edge of Maraka the Cancane make the journey every day from shade to sunlight and back. Grazing their cattle in the sunny fields and retreating to the cool shade of the forest in a cycle as old as the Starstilling itself.

Shivering Soil
Instant
Target land you control becomes an X/X Elemental creature until end of turn, where X is the number of lands you control. It's still a land.
A world so frozen, yet not even the ground itself will stand still.

I really don't know if I want an entire faction for lands, to be honest. However, lands should probably go in Frostwynd, because they're pretty permanent. And I'm still for the fairy tale angle for Frostwynd, so having locations move around suits me rather well.

I kinda wanted to reprint Rogue Elephant. But am leaning towards a functionally similar concept with a strong boost towards satisfying Mastery while leaving your pieces co-dependent and fragile.

Elephant Collar
Enchantment - Aura (C)
Enchant forest you control
When Elephant Collar enters the battlefield, put a 3/3 green Elephant token onto the battlefield.
When Elephant Collar leaves the battlefield, sacrifice all Elephants you control.
Enchanted land does not untap during your untap step.

Reprint Mulch.

I like Mown's, but it doesn't feel common (I see it as a bomb in limited).