Some want to be building up a large board of creatures, and others want to be rushing to combos to repeat them in order to win the game
The planes act like Pokmon's stadium cards and can be cycled through one at a time, and have a global effect on all players
The mana base is diverse enough to easily support two colors and the curve is built so that you wont skip your first few turns
There are lots of other lands I could mention, like Brian Snoddy's take on Urza's Power Plant, John Avon's Lantern-lit Graveyard and Submerged Boneyard by Chris Childs, and many others
"Always bet on black!" I've been a devoted black mage since was beat down by a Sengir Vampire playing one of my very first games and cast Spirit of the Night for the first time
You will still have green because you cast them, so if you don't have loads of GG three drops then these are even less likely to hurt you