CardName: Zendikar's Core
Cost:
Type: Legendary Land
Pow/Tgh: /
Rules Text: {T}: Add {1} to your mana pool.
{W}{u}{b}{r}{g}: Zendikar's Core becomes a 6/6 Elemental
creature with indestructible and protection from nonland
permanents. It's still a land. At the beginning of the next
end step, exile it. Return it to the battlefield under your
control at the beginning of your upkeep.
Flavour Text:
Set/Rarity: Multiverse Design Challenge Mythic
Zendikar's Core
M
Legendary Land
: Add to your mana pool.
: Zendikar's Core becomes a 6/6 Elemental creature with indestructible and protection from nonland permanents. It's still a land. At the beginning of the next end step, exile it. Return it to the battlefield under your control at the beginning of your upkeep.
See Challenge # 120.
I guess conceiving of a land that represents a whole plane is difficult, especially since even plane cards represent only a small portion of the plane.
: Add 
to your mana pool.
: Zendikar's Core becomes a 6/6 Elemental creature with indestructible and protection from nonland permanents. It's still a land. At the beginning of the next end step, exile it. Return it to the battlefield under your control at the beginning of your upkeep.
See Challenge # 120.
I guess conceiving of a land that represents a whole plane is difficult, especially since even plane cards represent only a small portion of the plane.