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That means you can fetch them with fetch lands such as Polluted Delta or Windswept Heath

Cabal Coffers and Urborg, Tomb of Yawgmoth are must-haves in basically any and all mono black decks

If a card copied by one of the tokens had any "when [this permanent] enters the battlefield" abilities, then the token also has those abilities and will trigger them when it's created

Rending Volley essentially says "destroy Archangel Avacyn," Magmatic Chasm helps break through board stalls against Bant Company and Humans, Uncaged Fury lets us steal games against decks heavy on sorcery speed removal, and Malevolent Whispers is great against decks playing huge Eldrazi and also fine when stealing a Kalitas, Traitor of Ghet or Archangel Avacyn

That landfall ability is a nice little bonus too

Overlapping archetypes are also pretty important to make sure that the giant monsters arent just duds to most players at the table