Each of those cards gets better as you add more copies of the others, but when evaluating different draws or game planning to attack the deck they are not equivalent
You could only win an Arena Foil Island by being one of the top two players in your local league , so like many of the other Islands on this list, the quantities that entered circulation were comparatively limited
Take, as a very good counter-example, Yuriko, the Tiger's Shadow
This could prove highly relevant, as those cipher cards will want a safe target to attach to
When the last is removed, you may cast it without paying its mana cost
The deck proved to have an incredibly powerful combo with the card Scapeshift, which let a player replace all of their Lands with different ones