Kor Entanglers: late effect that is good in Limited
It didn't even matter what other cards were in your deck, if you could play an early Pack Rat and use its ability, the game was yours
Their theory makes sense: you know that your commander will be available to play on a specific turn (given you've hit your land drops/ramp), so don't run other cards that you would also play on that turn
Thats how we like to do it
Here are some incentives for it: Cards like Corrupt, Cabal Coffers, Mutilate, and Defile want you to play as many swamps as possible, so their efficiency is maximized in mono-black decks
Verdant Catacombs Verdant Catacombs sits among it's cousins the Golgari cards, which are the best at playing lands from the graveyard and simply abusing the Catacombs