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The reason is that you need to have room in your deck to have lands to fetch

Getting all the applicable colors and a lord in the command zone works, but its second ability asks so much of you

Well of Lost Dreams Drawing cards and gaining life are unconnected effects at first glance, but they both share a tempo-negative nature: You spend resources to manipulate your hand or your life total, rather than your board

This card is a sideboard staple for decks that want to deal with specific threats like Karn, the Great Creator or Urza's Saga, and its flexible enough to fit almost anywhere

They are so deadly, in fact, that one of their number has been in the Top Five for cEDH decks for a long time