WU: Blink, artifacts, cycling control
WB: Lifegain aggro, go-wide, sacrifice
WR: Cycling aggro, artifacts control, go-wide, berserkers
WG: Wide and tall aggro/zerkers, cycling ramp
UB: Madness/artifact aggro, self-mill, mill
UR: Artifacts aggro, Discard/draw madness, spells control
UG: Madness aggro, self-mill, mill, lands
BR: Sac aggro, artifacts, Sneak/Reanimator
BG: Madness aggro, self-mill, lifegain(?)
RG: Berserkers, sneak, lands/ramp

Done by archetype:
Madness: Sultai aggro
Self-mill: Sultai control
Artifacts: Grixis aggro, Jeskai control
Sacrifice: Mardu aggro-midrange
Berserkers: Naya aggro
Lifegain: Orzhov aggro, Abzan control
Wide/tokens: Wx anything but U
Spells: Izzet control
Cycling: Boros aggro, Azorius control
Ramp: Naya midrange

ERRATAS:
-Rankle is 2/2
-Angel of the Ruins is 5/5
-Woodtimber Sower is 3/2

Marionette Master might actually be fair now
Phrexian Plaguelord not necessarily where I want my sac cards to be
boost synergy payoffs, especially those that cost lots of mana
Add green madness/self-mill payoff
Tinker? Daretti?
Saheeli is probably too good in a generic way - replace with some interesting buildaround or a really good draw-go card.
Is R removal too good in a low toughness cube?
GW Enchants - Reviving Melody, what else? Might just cut this it seems bad - more land sac shenangians? That one dude that sacs a land to give shroud?
3rd Dunes?
Stronger fatties?
Need more cool value engines?
MILL (why would you play it--needs to be better probably)
Tomb Raider, Exile B creature, Swarm of Bloodflies, skeletal scrying, yahenni, battle at bridge, dimir house guard
Cratermaker, pia nalaar, hammer of purph, insult // injury, cut //ribbons?
Deathgorge?
Rags // Riches?
Hedron Archive, sylvok, conjurer's, mindstone, prophetic prism?
Perilous Myr?

Shephered probably wants to be a squishy gy/sacrifice white two (do any exist?)