*Torchling > Devout Witness
Wanting to remove all of the morphling variations due to power creep and spotlight stealing. Devout Witness is a discard outlet, a repeatable disenchant, and a combo piece for Thran Forge, Parallax Tide and Parallax Wave (and maybe more)

Brightling > Parallax Wave
Wanting to remove all of the morphling variations due to power creep and spotlight stealing. Parallax Wave is a nostalgic combo card that has overlap into control builds and can stand up on its own. Popular premodern card

Trickster Mage > Chain of Vapor
Chain allows for more combos with Parallax Wave/Tide and also w/ stacked damage, plus it's an instant which fuels some of the other strategies of the cube. The mini-game of copying chain can be fun and also exploitable. Trickster Mage was lacking tribal support and synergy. This was leftover from when I was testing "turning off" tapped artifacts. It remained as a discard outlet with slight nod to removal/tempo, but Chain hits more boxes

Mental Note > Geistwave
Mindslicer > Perilous Research
Cephalid Retainer > Rushing River
Niv-Mizzet, The Firemind > Time Warp
Immobilizing Ink > Parallax Tide
Cabal Therapist > Sarcomancy
Cairn Wanderer > Skeletal Changeling
??? > Kavu Runner
Dragon Mage > Hordeling Outburst
Seal of Fire > Shock (for Dreadhorde Arcanist, Young Peezy, Talrand, Bedlam Reveler, Ghitu Chronicler, Salvager of Secrets, Revolutionist, Tazeem Roilmage, etc, thanks Zelu0)
??? > Alpha Kavu
Thornling > Battlefield Scrounger
Voracious Cobra > Mystic Snake
??? > Viseling
Rackling > The Rack
Hollow Specter > Ankh of Mishra
Doom Cannon > Phyrexian Altar
Coat of Arms (Exodus version)
Prismari Campus > Grixis Triome
Cascade Bluffs > Esper Triome
Flooded Grove > Bant Triome
Lorehold Campus > Naya Triome
Rugged Prairie > Jund Triome
*Ifnir Deadlands > Polluted Delta
*Ramunap Ruins > Bloodstained Mire

*Need to order