Buhhhhhh....

See also: http://draw3cards.com/questions/6983/should-there-be-a-mythic-rare-land

In which I mention my attempt last year at precisely this, Summit of the Wyrm.

For reference, the mentioned cards:

­

Entered with Spawning Grounds. I think Summit of the Wyrm might be better though.

My entry is Land of Denial.

Mythic on land is tricky. You want the card to be evocative and cool, but not busted. I added Grave Font to the pile, hoping to capture a bit of the feel of the borkeness that is Ancient Tomb without having it get all busted in the early game.

My entry is Mirror Grotto.

Let's try again... Vanishing Point (This creature enters the battlefield with PointASWORDS time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)(http://multiverse.heroku.com/cards/11590)

­Cave of the Ancient Spirit, a really simple man land.

I created Everhome, the Shifting Realm.

Here's my attempt: Foriys.

I made Lae, Nexus of Trade.

I created Citadel of the Foremost and Aftalan's Sanctum.