The Signpost Uncommon Game

[Surging Chaos]

Harbinger of Xenagos RG
Creature -- Satyr
Heroic — Whenever you cast a spell that targets Harbinger of Xenagos, put a +1/+1 counter on Harbinger of Xenagos.
Spells you cast that target creatures you control have split second.
2/2

Next: UR Scry

[Feyd_Ruin]

Searing Seer
Creature — Human Wizard
When Searing Seer enters the battlefield, Scry 2.
Whenever you scry, Searing Seer deals X damage to any target, where X is the number of cards scried.
2/3

Next: having more creatures than your opponent(s).

[Subject16]

Fires of the Mighty 1RG
Enchantment (U)
As long as you control more creatures than each other player, creatures you control have haste.
2RG: Create a 1/1 green Saproling creature token. Fires of the Mighty deals 1 damage to each opponent.

Next: A UB Artifact for Vedalken Tribal

[dyd]

Probability Processor 1ub
Artifact
At the beginning of each end step, if a Vedalken entered the battlefield under your control this turn, scry 1.
At the beginning of each end step, if a Vedalken died under your control this turn, fateseal 1 unless an opponent pays 3 life.


Next: gw instant for outlast or bolster

[Mookie]

Surge of Vitality 1GW
Instant
Bolster X, where X is the number of tapped creatures you control. Then untap all creatures you control with a +1/+1 counter on them.

Next:
BW creature for Escape

[RattingRots]

Wall of Nix 1WB
Creature - Wall
Escape - 4WB, Exile three other cards from your graveyard.
Defender
Whenever ~ or another card you own escapes, return up to one card exiled this way to your hand.
0/4

Next:
UG enchantment for multicolor/color matters.

[JovialJovian]

Neural Gel 1UG
Enchantment - Aura
Enchant permanent
Flash
When enchanted permanent is put into a graveyard from the battlefield, draw a card for each of it's colors.
Enchanted permanent has hexproof.

Next: BR tribal Minotaurs

[Subject16]

Skophos Warcaller 2BR
Creature — Minotaur Warrior (U)
Haste
When Skophos Warcaller enters the battlefield, search your library for a Minotaur card, reveal it, and put it into your hand. Then shuffle your library.
Few have seen the minotaur polis of Skophos. Fewer still have returned to speak of it.
4/3

Next: WU Creature for Investigate

[dyd]

Azorius Investigator 2wu
Creature - Vedalken Soldier
When ~ enters the battlefield, investigate. (Create a colorless Clue artifact token with "2, Sacrifice this artifact: Draw a card.")
1wu, Sacrifice a Clue: Detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)
1/2

Next: bg creature for scavenge

[void_nothing]

Kraul Rot Druid BG
Creature - Insect Druid
Deathtouch
T, Exile a creature card from your hand: Add BG.
T: Put target exiled creature card you own into your graveyard.
1/1

Next: WU creature for vigilance

[dyd]

Illumination Cherub 2wu
Creature - Angel
Flying, Vigilance
Attacking creatures you control have "t: Scry 1"
2/2

Next: rg enchantment for conspire or retrace or ripple

[Subject16]

Dive into History 1RG
Enchantment (U)
At the beginning of your upkeep, exile a card at random from your graveyard. You may play that card this turn.
2RG: Return target land card from your graveyard to your hand.
"With these, we can finally retrace our steps."
—Samut

Next: WB Creature for Camel Tribal

[spacemonaut]

I am not sure what Camel tribal would do, but the thing it could absolutely do with is more camels.

Matron of the Wastes 2WB
Creature – Camel
Vigilance
Whenever a land enters the battlefield under your control, create a 2/2 white and black Camel creature token. If that land is a Desert, put a +1/+1 counter on Matron of the Wastes.
2/2

Next: BG creature for Squirrel tribal

[Subject16]

Lord of the Hoard 1BG
Creature — Squirrel (U)
Whenever a Squirrel you control deals combat damage to a player, create a Food token.
1B, Sacrifice a Food; Create a 1/1 green Squirrel creature token.
1G, Sacrifice a Food: Squirrels you control get +1/+1 until end of turn.
She will not part with a single acorn.
3/2

Next: A GW Artifact for Self Mill/Recursion

[JovialJovian]

Sigil of Life's Cycle 3GW
Artifact
Sacrifice ~: Return target creature or land card from your graveyard to the battlefield.
Recover (G/W)(G/W)(G/W)(When a creature is put into your graveyard from the battlefield, you may pay (G/W)(G/W)(G/W). If you do, return this card from your graveyard to your hand. Otherwise, exile this card.)

Next:
RU coin flip

[Mookie]

Edge of Chaos 3UR
Whenever you flip a coin and it comes up heads, draw a card.
Whenever you flip a coin and it comes up tails, ~ deals 2 damage to each opponent.
2UR: flip a coin

Next: RW creature for control

[Atraxian]

Soul Bomber
Creature - Goblin Shaman
When a permanent is exiled or enters the battlefield from exile ~ deals 1 damage to all other creatures.
If a creature damaged by ~ would die, exile it instead.
2/2

Note: reworked the other version I made to work better with white permanent exile enchantments and red exile burns and potentially sweep the board.

Next: reanimator

[void_nothing]

Return of the Herald WB
Instant
Return target creature with converted mana cost 2 or less from your graveyard to the battlefield. Then, for each creature you control that entered the battlefield from your graveyard this turn or that you cast from your graveyard this turn, put a number of +1/+1 counters on that creature equal to the number of those creatures. (For example, if two creatures entered from your graveyard this turn, put two +1/+1 counters on each of them.)

Next: Creature for GU aggro

[Mookie]

Swimmer of the Deep Streams 3UG
Creature - Merfolk
When Swimmer of the Deep Streams enters the battlefield, draw a card for each creature that attacked this turn.
UG: Swimmer of the Deep Streams can't be blocked this turn.
3/4

Next: RG creature for Ikoria's inevitable 'giant monsters matter' theme.

[Atraxian]

Behemoth Chowd
Creature - Goblin
Feed - as you cast a creature spell with power 5 or greater, you may sacrifice ~. If you do, reduce its casting cost by .
If ~ was fed to a creature, that creature enters the battlefield with an additional trample counter (that creature has trample as long as it has a trample counter).
2/2

Note: just added a little speculation on the workings of keyword counters.

Next: a small flyers matter

[void_nothing]

Marshal the Windrunners 2WU
Enchantment
At the beginning of combat on each player's turn, 1/1 creatures you control gain flying until end of turn.
3W: Create a 1/1 white Soldier creature token with lifelink.
3U: Creatures with flying you control have base power and toughness 4/4 until end of turn.

Next: Enchantment for BG "put -1/-1 counters on your own creatures"

[Mookie]

Spreading Sickness GB
Enchantment
Whenever one or more -1/-1 counters are placed on a creature you control, put a -1/-1 counter on target creature you don't control.

Next: artifact for WU 'shuffling into library matters'

[Atraxian]

Multibulbous Hourglass
Artifact
Whenever a permanent is shuffled into its owner's library from a graveyard or from the battlefield, put a charge counter on ~.
, , sacrifice ~: choose up to X target permanents where X is the number of charge counters on ~, they don't untap during their controller's next untap step.
One might think the glassblower had hiccups that day.

Next: reach creatures matter

[JovialJovian]

Silken Canopy 3RG
Enchantment
Creatures without reach can't block.
3G: Create a 1/2 green Spider creature token with reach.

Next:
WB artifact for artifacts matter

[void_nothing]

Wordmarrow Phylactery 1WB
Artifact
Each artifact you control has indestructible and "2, Pay 2 life: Untap this artifact" as long as it entered the battlefield this turn.
T: Target creature gets +2/+1 until end of turn. If it's an artifact creature, it gains haste until end of turn. If it's a Golem or Zombie, it gains lifelink until end of turn.

Next: RG artifact for "fast mana" (rituals) matters