Mystery Key

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  Glacial Fortress

  $0.47

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  Prairie Stream

  $0.43

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  The Key to the Vault

  $0.93

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  An Offer You Can't Refuse

  $4.14

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  Sunken Hollow

  $0.52

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  Adarkar Wastes

  $0.50

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  Azorius Signet

  $0.50

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  Wayfarer's Bauble

  $0.57

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Suggestions from EDHREC, narrowed to what is on our shelf.