Mishra's Helix

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  Thran Dynamo (Retro Frame)

  $4.45

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  Unwinding Clock

  $22.73

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  Foundry Inspector

  $0.98

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  Darksteel Citadel

  $1.15

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  Urza's Tower (Forest)

  $0.97

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  Worn Powerstone

  $0.53

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  Urza's Mine (Pulley)

  $0.83

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  Urza's Power Plant (Sphere)

  $0.96

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