He's right, you can only have 4x Darksteels in he deck if it's any kind of format. People you play will probably perfer your deck to at least be type 1 if nothing else.
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Who are we to question Negrodamus?
Nice deck, it looks similar to my elf deck. The only difference I would do is -3 Rofellos, -5 forests, + 4 Elvish Archdruid, and +4 Seeker of Skybreak. I've also gotten big into card advantage, especially in a deck like this that has alot of mana to spend, so Glimpse of Nature, Slate of Ancestry, or anything like that might be good. Also Living Wish and Sylvan/Worldly Tutor might be useful. Hope the ideas help!