Not all of these edits are card-for-card. This cube is still a baby and if you can't tell by the 90 cards of edits, I'm still exploring the directions I want to go with this cube. Here are some of the motivations behind some of the edits:

-Reduce the average Power & Toughness of cube to help let Kavu shine.

-Increased tribal payoffs and shapeshifters to smooth out tribal themes

-Trim out most of the mono-black control payoffs (Nantuko Shade, Corrupt, etc) as they are not flexible limited cards

-Added more sac outlets to take advantage of damage-on-the-stack

-Cut all of the "Tapped Artifacts Lose All Abilities" cards, and some of the cards focused on "Tapped Blockers Deal No Combat Damage"

-Cosmetic upgrades

INDIVIDUAL CUTS:

-Chimeric Idol : The man-lands take this role in the control decks way better than Chimeric Idol, and there are already lots of man-lands (thanks for that feedback, Alex)

-Forsaken City : Only playable in Stasis lock, the card is too terrible to overlap into other archetypes

-Goblin Welder / Goblin Engineer : Too slow for red with minimal payoffs. Added Emry, Luker of the Loch to fill the similar role in a more durdley color (merfolk wizard for tribal, too)

-Wirewood Lodge : Too narrow and the lack of producing colored mana is too much of a drawback. Added an additional Gruul land in its place to help cast all of the Gruul cards

-General's Enforcer : I thought this was a perfect token maker and graveyard hate, but it makes all of the changelings indestructible (as Legend is a creature type in this cube) so I have to cut it.

CARDS THAT I REALLY WANT TO ADD (but don't know what to cut):
-Baral, Chief of Compliance
-Cephalid Inkshrouder
-Brine Shaman
-Skeletal Changeling
-Nantuko Husk
-Stronghold Assassin
-Venomous Changeling
-Deathmark Prelate
-Tortured Existence
-Dance of the Dead
-Infernal Tribute
-Ancient Kavu
-Bloodshot Cyclops
-Ghitu Fire
-Volcanic Geyser
-Blast From the Past
-Pandemonium (to combo w/ Saproling Burst, thanks Dwhite)
-Fyndhorn Elves
-Quirion Elves
-Skryshroud Elf
-Radiant Kavu
-Skull Catapult
-Coat of Arms
-More artifacts

CONCERNS:

-Not enough aggro

-Too many cuts to Psychatog and Cycling archetypes

-Tribal may still be unviable due to harsh On-The-Rails drafting or lack the payoffs. I will need to check tribe counts after this edit to see where I need to rebalance

BORDER COUNT:

To Be Upgraded: 5
Modern Alt Borders: 14
Modern Bordered Cards: 150
Retro Borders: 63

I'll be adding tags to my Cube Cobra list so I can filter easier and get more accurate numbers