At nine mana, the Darksteel Forge grants all your artifacts the keyword indestructible, making them immune to any sort of effect that would destroy them, including spells and combat damage
It also turns into a cool dinosaur
Even if you exile two useless lands, you gain two 3/1 dinosaurs
Final Fantasy VII - Plains - Seventh Heaven/Sector 7 Early on in Final Fantasy VII , a small bar in Sector 7 acts as the base for the eco-terrorist group Avalanche
It also produces a creature token when it enters which is (once again) great for decks that want fodder to sacrifice
The white card in the cycle offers continual value through the game, and in a lot of cases, it reads landfall make a token, which is pretty sweet