When Kjeldoran Outpost comes into play sacrifice a plains or bury Kjeldoran Outpost.

: add


: Put a Soldier 1/1 white Soldier token into play under your control.
I would use this as a starting ground for creature generating Lands. Making it tap for colorless only slightly balances out the "sac a plains" drawback... its a bit better because you can play your land on turn 1 with no drawback.
Now when it comes to the creature ability, this card is 2 mana, tap the land = 1 creature.
Yours is no mana, tap the land, 2 life = 2 creatures.
I think the main reason it's too strong is that it doesn't cost any mana and therefor you can use it turn 1. If you played this land on turn 1 and 2, you could have delt 18 uncounterable damage by turn 4 with 10 dudes in play. [0+2+6+10 = 18]
Also an opening hand of: War Trenches, War Trenches, Forest, Echoing Courage is a 4 card turn 3 win.
I think additional drawbacks are needed.