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Mirrodin and Scars of Mirrodin blocks are complementary. They are both artifact blocks. Lets add a bunch of SOM block colorless artifacts into the mix. We have here 17 artifact creatures, 9 artifact equipment, and 8 artifacts. If we start off with the Mirrodin colorless selection only, we have 17+6 creatures, 9+10 artifact equipment and 8+4 artifacts. 23+19+12 = 54, which is just enough to build a 51 cards + 24 mana Modern Constructed Deck. Of course, adding these cards to the mix makes this selection more a Scars of Mirrodin selection with a few Mirrodin cards added in than the other way around.
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