These lands were not very good unfortunately, even though they inspired equally bad lands in Tempest and Champions of Kamigawa
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For one, humans love to watch numbers incrementand whether it's your bank account, your level in an RPG, or your life total in Magic , having more of something is always nice
For example, the cards from your library that Mirror of Fate exiles are exiled face up
The huge upside here is sacrificing lands like Fabled Passage, playing it from the graveyard, and pumping creatures on each of your turns
This effect can be awesome, and it can be game crippling, hence the word 'Chaos' in the name