Cheap alternatives could be something like Iridescent Vinelasher to deal damage via landfall, Titania, Protector of Argoth to generate value, and Moonshaker Cavalry as an impactful play
That's exactly what surveil lands provide: an alternative, fetchable land that provides value in situations where you don't need untapped mana right away
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The art on a card can affect its value
Protecting Krenko, Mob Boss is paramount to this deck's strategy, as is filling out the rest of the deck with cheap Goblin threats and payoffs that make them much more than 1/1 threats