Never Were
This sixth color was tested for release in Planar Chaos, but scrapped in design.
What is Purple?
Overlord of the Hauntwoods
What is an Everywhere land?
This group of decrepit ghosts led the Orzhov for a while before being killed off by Kaya.
Who are the Obzedat and/or Ghost Council of Orzhova?
Trix
What are Donate and Illusions of Grandeur?
Damnation
What is Wrath of God?
This basic land that tapped for colorless was planned for Invasion and later Conflux, but never saw the light of day.
What is Barry's Land?
Sacred Cat
What is a 1/1 white zombie cat named Sacred Cat?
This weird golem mage gained his power from the Mirari, then renamed the world of Argentum in its honor.
Who is Memnarch?
Fruity Pebbles
What are Goblin Bombardment, Enduring Renewal, Ornithopter, Phyrexian Walker, and/or Shield Sphere?
Endling
What is Morphling? (And Aetherling/Brightling/Torchling/Thornling?)
This technically still-extant but functionally scrapped plane was superseded by Theros, as according to Maro the name couldn't clear legal.
What is Arkhos?
Mouth//Feed
What is a 3/3 green Hippo?
This descendant of Sisay took captainship of the rebuilt Weatherlight from Jhoira.
Who is Shanna?
Cheerios
What are Glimpse of Nature, Ornithopter, the three kobolds, Memnite, and Brain Freeze/Tendrils/Grapeshot/some storm kill?
Frostbite Pyromental
What is Lightning Skelemental? Alternatively, being kind, what are Ball Lightning, Groundbreaker, and/or Spark Trooper?
This scrapped Hour of Devastation mechanic, later turned into a vertical cycle, had your opponents choose between losing 3 life, discarding a card, and sacrificing a nonland permanent.
What is Torment?
Boris Devilboon
What is a 1/1 black and red demon named Minor Demon?
This Planeswalker advisor to the state of Minorad on Dominaria was Jared Carthalion's grandfather.
Who is Grenfell Mor?
Sunny Side Up
What are the Odyssey Egg cycle, Second Sunrise, Reshape, and/or Pyrite Spellbomb?
Magus of the Mirror
What is Mirror Universe?
This scrapped keyword for Avacyn Restored started cards with it in exile.
What is Forbidden?
Puppet Conjurer
What is an 0/1 blue Homunculus artifact?
Name three of the Planeswalkers Garruk murdered in the Duels of the Planeswalkers storyline.
Who are Vronos, "Icy", Boragor, Kento, and Grinth?
Full English Breakfast
What are Volrath's Shapeshifter, Survival of the Fittest, and/or Phyrexian Dreadnaught?
Revered Dead
What are Drudge Skeletons?