Priests of Norn – Mirrodin Besieged common. Prior to Mirrodin Besieged, the Phyrexians have never really been thought of as being associated with white mana. But after all, they do represent a highly structured and organized society...
Dancing Scimitar – Arabian Nights rare. Well before the living weapons of Mirrodin Besieged, there was Dancing Scimitar, a sword animated by magic in Arabian Nights. Its 5 toughness presumably represents how hard it is to kill a sword, not an inordinately strong metal.
Poisonbelly Ogre – Guildpact common. The flavor text for Poisonbelly Ogre speculates that it might be of either Simic or Golgari origin. Of the two, Golgari seems more likely, since the Simic guild doesn't involve black mana. Neither guild was in Guildpact, but the Ogre surely isn't Orzhov.
Metalworker – Urza's Destiny rare. Back in the days of 2000-2003, when Metalworker was tearing up tournaments, the deck was sometimes referred to as "mono-brown" because it was all artifacts. That name stopped working when artifacts stopped having brown card borders.
Phyrexian Rager – Apocalypse common. Phyrexian Rager first appeared in Apocalypse, then showed up in Tenth Edition and Duel Decks: Garruk vs. Liliana. And it's also in Mirrodin Besieged! That Horror sure gets around.
Mirrodin's Core – Darksteel uncommon. According to the Mirrodin Style Guide, "The interior of Mirrodin is a vast, featureless expanse of silvery, dull metal. The only features of the landscape are the mycosynth, the occasional artifact creature, and Panopticon. The interior is lit by the mana-core sun, which washes everything in intense, pure-white light. The mana core appears as a giant sphere of pure white plasma suspended at the nucleus of the planar sphere."
Arrest – Mercadian Masques common. We're going to skip over the fact that Arrest is in both Mirrodin and Scars of Mirrodin, because we've never noticed its Mercadian Masques flavor text before. Did you know the person being arrested is Orim, Samite Healer? For murder?
Myr Battlesphere – Scars of Mirrodin rare. Statistics show that there are more Myr on Myr Battlesphere than on any five cards put together. The art was provided as a wallpaper here.
Auriok Siege Sled – Darksteel uncommon. In case you've ever wondered, if you use both of Auriok Siege Sled's abilities on the same creature, that creature won't be able to block the sled that turn.
Blade of the Sixth Pride – Future Sight common. Future Sight brought the "future-shifted" card frame into Magic, and the future-shifted vanillas had their own textless version. There's room for eight mana symbols there, which ought to be enough for any creature. Well, any vanilla creature. Sorry, Progenitus and B.F.M. (Big Furry Monster)!
_____ – Unhinged uncommon. What can you do with a card with no name? Well, not much. But what can you do with a card that can set its own name to anything? Mark Gottlieb covered this question in detail, and the answer is: a lot! Didn't think of Bazaar of Wonders, didja?
Cyclopean Tomb – Masters Edition IV rare. The Alpha version of Cyclopean Tomb was printed without a mana cost. This error was corrected in Beta (it's ), and that was the last nonland card printed without a mana cost ... until Evermind.
Genesis Wave – Scars of Mirrodin rare. Genesis Wave was the key card in David Williams's deck at the 2010 Magic: The Gathering World Championships. For a complete decklist and video deck tech, check out the Daily Deck for December 17, 2010.
First Come, First Served – Unhinged uncommon. In case you're wondering, the Unhinged FAQ says that tokens don't have collector numbers. But that was before tokens started being included in packs, and the modern tokens do have numbers. Well, Unhinged packs actually did have tokens with collector numbers, but back then, they were in the minority.