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Spire of Industry: great artifact flavor, but locks you into an artifact deck for the mana versatility.

Two spells in U/R have been great early enablers at setting up card quality or graveyard-oriented strategies: Careful Study and Faithless Looting

Though, it is difficult to make the most of them without a higher number of flip monsters and token spawners respectively

You could replace the rare dual lands with some common tapped dual lands, and it would still function, but it would be less competitive because we'll have to play off-curve sometimes

Included in the deck are two Dark Patch, which should help you speed up the process of powering up Darkrai