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When this artifact is put into a graveyard from the battlefield, at the beginning of each of your upkeeps for the rest of the game, remove all mire counters from a land that a mire counter was put onto with this artifact but that a mire counter has not been removed from with this artifact

While they arent the most consistent cards, Im sure you can see why I think they're some of the most fun cards in Magic

When Eternal Witness enters the battlefield, you can return a card from your graveyard to your hand

Getting back fetch lands is always nice, but there are plenty of other lands that send themselves to the graveyard for value, like Strip Mine, Wasteland, and the aforementioned channel lands

Oh, I didnt even know Ragavan was in the set