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The reason not to run mutiple unown dark is so you don't start with one because starting with one is really bad. I think you don't need many DCE because you can use the Pachi/Shay engine to power Tornadus as well.
I had Sp. Dark because if I am facing Donphan, I can attach DCE and Sp. Dark to Tornadus so I don't have to attach an energy to Tornadus every turn. I don't need Burnt Tower because this deck runs so much energy.