Protector of the Dunes

As long as you control three or more plains, Protector of the Dunes has indestructible, trample and vigilance.
Whenever Protector of the Dunes attacks, sacrifice a land you control.
Whenever Protector of the Dunes enters the graveyard from the battlefield, return up to three plains from your graveyard to the battlefield tapped and gain 3 life.