Karoo actually lets you produce more mana with the same number of lands by returning one of your Plains to your hand, and lands like Buried Ruin can help retrieve a mana rock or another key artifact lost early in the game
Esper is a deck that wins by exploiting the fact that Sphinxs Revelation is the best card in the format
If you controlled the token, Neva's ability will trigger
Nowadays, there are multiple other answers just as efficient as Fatal Push like Prismatic Ending and Unholy Heat, and the card has been slowly replaced with these alternatives as they are just more versatile
Nekrataal, Uktabi Orangutan, and Knight of the Mists were just three of these powerhouses
In addition, blue-based control can be a tough matchup for black decks, and The Torment of Gollum can be a great tool for fighting back