Booster Pack Game

C#3

Germinate Artifact 
Instant 
Create a 0/0 red and green Germ creature token with trample, haste, and "At the beginning of the end step, sacrifice this creature."
Attach target Equipment to it.
"Hey... isn't that your sword scuttering over there?!"

C#5

Zarosian Monolith 
Artifact 
Network (Whenever you cast an artifact spell, untap this. This ability triggers only once each turn.)
Zarosian Monolith doesn’t untap during your untap step.
: Add one mana of any color.

Delve into the Ancestry
Instant
Reveal at the top five cards of your library. You may put an immaterial card among them into your hand and the rest into your graveyard. (Instants, sorceries and enchantments are immaterial.)
, exile ~ from your hand: Target land you control gains ": add one mana of any color to your mana pool."

I'd like for the mages mechanic to be something more than immaterial, but I think we could do a 2 mechanics per faction + living weapon as a mix between. Immaterial could also be just a general thing and not even a mechanic.

Also, fixing. Not making treasures because that would break the symmetry me thinks.

Common 9

Aether Retriever
Enchantment Creature - Dog
When ~ enters the battlefield, you may sacrifice a non-creature, non-aura enchantment. If you do, return target other enchantment from your graveyard to your hand.
1/2

Uncommon #1

Induce Malfunction 
Instant 
Destroy target creature. If that creature is modified, its controller loses 3 life.
As the essence flickers, the weapons drop.

Uncommon #3


Hide of the Behemoth
Artifact - Equipment 
Living weapon  (When this Equipment enters the battlefield, create a 0/0 green and blue Germ creature token, then attach this to it.)
Equipped creature gets +2/+2 and has trample and ward .
Equip 
Equip 

Technically the booster is done, but wanted to get this Mythic in here:

Vivien, Skallan Explorer 
Legendary Planeswalker - Vivien 
You may cast creature cards exiled with Vivien.
+1: Exile the top card of your library. If it's a land card, put it onto the battlefield tapped under your control instead.
-3: Exile target artifact or enchantment an opponent controls. If it was an Aura or Equipment, create a 0/0 red and green Germ token with three +1/+1 counters on it.
-7: You get an emblem with "Creatures you control get +2/+2 and have trample and haste."
5

(Note, she can cast artifact and enchantment creatures that she exiles with her -3).

Sorry but I'm a tad too busy to post a full judging.

The winner is vizionarius for Zarosian Monolith, a simple but elegant incorporation of lordpat 's network mechanic into a mana rock. Runner-up is lordpat for Soul of Affection and its reminisce mechanic, an interesting combination of evoke and aftermath.

P. S. It's curious that nobody tried to dig into the lore too deeply, but what I had in mind was:

The leader of a druidic sect (the one quoted in my reprint of Fracturing Gust) saw that the continued war between the artifice-inclined Zaros and the enchantment-inclined Va'nel would end their civilization as it was. The plane's name, Phermios, alludes to the Fermi paradox, one of the theories pertaining to which posits that "it is in the nature of intelligent life to destroy itself." As such, in order to prevent a climax to the war which could have apocalyptic implications, the head of the druidic sect tapped into the plane's leylines a la Nissa and cast a planewide Mass Polymorph targeting all humanoids, turning them all (including themself) into Germs. The humanoids, limited as they may be, are now striving to find a way to reverse this curse. In truth, the war didn't end with the casting of the spell; each side is intent on reversing the curse selectively, allowing them to crush the other faction once and for all. It is a race, then, as to who will be able to do so more swiftly.

Set Name
Season of the Mist

Plane
Temporis

Flavor
Temporis is a plane where seasons guide worshippers' rituals and has a large effect on how the inhabitants live their lives. Some place high importance on a single season, whereas other Orders focus on a couple each year, with the Egesh Clerics aligning themselves not with seasons, but the Mists, and await a great mystical event to come. A secretive but powerful group of Shamans, the Taltosh, believe that great powers can be unlocked during Eclipses. The Egesh and the Taltosh have their followers in the various other factions, but some are more drawn to their message than others.

Themes
Phasing and Exile (which is also used as a resource for cards) play a prominent role in the set. Seasons are found to be important, and have a direct effect on gameplay. Lands are enchanted and sometimes have powers other than tapping for mana.

Factions
Worshipers of the four seasons, interspersed throughout the plane:Winter (), Spring (), Summer (), Autumn ().
Order of the Equinox, based in their walled abbeys ()
Order of the Solstice, based in their forest villages ()
The Egesh, based in towns by the edge of the Mists ()
The Taltosh, based in the dark forests ()
Aligned with the Egesh ()
Aligned with the Taltosh ()

Example Cards

Common #2

Summer Drizzle 
Instant
Target artifact phases out. (While it’s phased out, it’s treated as though it doesn’t exist. It phases in before its controller untaps during their next untap step.)
Draw a card.
"Would you help me bring the garden tools into the shack, dear? Wouldn't want to let them rust faster."

Common 3

Urge to Hibernate
Enchantment - Aura
Enchant creature with toughness 3 or less
When ~ enters the battlefield scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)
Enchanted creature doesn't untap during it's controller's untap step.

Sage of Lost Horizons
Creature - Elf Shaman
Flash
At the beginning of your end step, if no spells or two or more spells were cast this turn, scry 1.
They see the world as its changes, at its cusps, in the grand Solstices, the horizon breaks into the light and the dark.
3/2

common #7

Sudden Bloom Collector
Creature - Elf
When ~ enters the battlefield, if was spent to cast it, scry 2.
When ~ enters the battlefield, if was spent to cast it, exile the top card of your library. You may play it this turn.
3/1

Common #9
Extreme Weather
Enchantment - Aura
Enchant Land
Phasing
Whenever enchanted land is tapped for mana, it produce one additional mana of any type that it could produce.