Steamflogger Boss – Future Sight rare. If you're like most people, you probably haven't spent much time looking at the art of Steamflogger Boss. And that means you've missed something really cool hidden in the art! This arcana has the scoop.
Holy Day – Legends common. The Legends flavor text for Holy Day is from Silex Scintillans, a collection of seventeenth-century religious poems. The specific poem is "The Night," which is how it's credited in Eighth and Ninth Edition.
Feast of the Unicorn – Classic Sixth Edition common. Doesn't "Feast of the Unicorn" sound pleasant and tranquil? A flock of unicorns, all standing around placidly eating grass or something? Unfortunately for unicorn-lovers, this turns out to be a feast of unicorn instead.
Windbrisk Raptor – Shadowmoor rare. The Windbrisk Raptor was concepted as a roc, a giant bird that swoops down on its prey. If you look carefully, you can see a horse by one of its talons. That's a large bird!
Muraganda Petroglyphs – Future Sight rare. A petroglyph, as you are no doubt aware, is a carving or line drawing on rock, especially one made by prehistoric people. What does this tell us about the mysterious land of Muraganda? Not much, really. But we do get to see Muraganda itself in the Planechase card Feeding Grounds.
Winds of Rath – Tempest rare. Pro Tour–Los Angeles 1998 was Tempest Constructed, which meant that the only "wrath effect" in the format was Winds of Rath. This goes a long way toward explaining why the key card in David Price's tournament-winning deck was Giant Strength!
Who/What/When/Where/Why – Unhinged rare. Mark Rosewater knew he'd want to do a card like this in Unhinged, but was momentarily stopped by the fact that a card made up of two doubly-split cards would be only four colors, while Magic prefers groups of five. The solution? One more level of splits!
When Fluffy Bunnies Attack – Unhinged common. Some cards have a clear, unambiguous link between their flavor and their mechanics. Others have a more tenuous connection. Then there are cards like When Fluffy Bunnies Attack, where the lack of a connection is turned into a virtue!
Journey to Nowhere – Zendikar common. If you look through the hole in the middle of the art of Journey to Nowhere, you can see the place that the target of the spell was presumably sent. It actually looks like a more relaxing place to live than the spooky forest in the foreground. In fact, it's kind of reminiscent of Warren Mahy's Island for Lorwyn!
Yomiji, Who Bars the Way – Betrayers of Kamigawa rare. The place that Yomiji is barring the way to is "the afterlife," or in game terms, "the graveyard". Yomiji prevents legends from dying, bringing them back to fight another day. Presumably, Yomiji can't be bothered with saving cannon fodder.
Adventurers' Guildhouse – Legends uncommon. One of the more obscure rules changes that came in with Magic 2010 was the alteration to the meaning of "bands with other". This means that adventurers who hang out at the guildhouse are now slightly more likely to be able to get some use out of it.
Land Aid '04 – Unhinged common. The reference is to "Band Aid" (1984) and the series of "Farm Aid" benefit concerts. Whoever that is on stage is probably not an Elvish Impersonator, though, since he's not wearing one of those cool jumpsuits.
Root-Kin Ally – Ravnica: City of Guilds uncommon. The only "Ally" from before Zendikar is the mighty Root-Kin Ally from Ravnica. As you can see, it has a fairly direct implementation of the idea that it gets bigger from having a bigger army around it.
Kabira Evangel – Zendikar rare. An "evangel" is not a kind of angel, which is why Kabira Evangel doesn't have wings. It's actually another word for "evangelist", which is why the character is a cleric who appears to be reading to his allies.