Vesuva

Most clone effects target the part of the battlefield with stats: creatures, bodies, abilities. This one copies the piece nobody thinks to duplicate, the land, and in doing so it becomes a tool for breaking the assumption that a manabase grows one card at a time. Point it at your own Cabal Coffers and you have a second; point it at a Mishra's Factory and you have another creature-land for the cost of a colorless slot. The copy is the genuine card, not a token: if it copies a legendary land, the legend rule applies; if the original leaves, the copy stays. The enters-tapped clause is the tempo tax that keeps a land which can become any land from being free, and the card is self-limiting in the worst case (point it at nothing and it is a colorless dead draw). That worst case is the constraint that makes the upside sane: the copy is only ever as strong as the best land already in play, yours or an opponent's. A ceiling that floats with the table, rather than a fixed rate, is the unusual part of the design. It does not fill a gap in your colors so much as it lets you tax the rest of the board's land design, copying the one piece of the battlefield that ordinary clones leave untouched.