While commons might not come to mind when you think of valuable cards, quite a few are worth a pretty penny, particularly those from older sets
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
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
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
The order they entered the battlefield should remain clear
Thats how we like to do it