Karoo

This land enters tapped.
When this land enters, sacrifice it unless you return an untapped Plains you control to its owner's hand.
{T}: Add {C}{W}.

Karoo comes into play tapped.
When Karoo comes into play, return an untapped plains you control to owner's hand or bury Karoo.
ocT: Add {W} and one colorless mana to your mana pool.

The List

Commander 2014

Karoo enters the battlefield tapped.\r
When Karoo enters the battlefield, sacrifice it unless you return an untapped Plains you control to its owner's hand.\r
{T}: Add {1}{W} to your mana pool.