I wasn’t crazy. Here are a few quotes from around the web regarding Sphinx of Jwar Isle:
“The real creature I’m looking at including in this Bant brew is Sphinx of Jwar Isle. What is Jund supposed to do against him? He’s bigger than all their creatures, they have absolutely no way to remove him other than a Jund Charm when I’m blocking, and he gives my late game fetchlands a ton of value by enabling me to see the top card, as if it’s a land I can shuffle into a potential spell.
[On the matchup versus Jund:] Sphinx is the real bomb in here, and running it out turn 6 with no backup is the safest creature you can invest mana into in the Standard format. The longer he stays in play, the more foresight he provides, and he plays offense as well as being a stalwart on defense. I’d expect the number of these cards to rise dramatically to counteract Jund’s narrow answers to it.” —Kyle Sanchez
“Sphinx of Jwar Isle has been in just about every non-aggressive deck list since Zendikar’s release, but the Jwar Jwar Movement has been steadily gaining followers in the past few weeks. Ebay, which is usually a leading indicator, supports the upwards price trends. Playsets are climbing from $4 closer to $6 or $8, so it’s not out of the question for the Sphinxes to end up being worth a few dollars each. Many vendors on the internet still have them at a dollar, which is too low. It’s even worth about 1.3 tickets on Magic Online, which roughly translates to $1.25. Grab a few playsets and you’ll double up without much work.” —Kelly Reid
“If all of a sudden, everyone said, “Let’s boycott Baneslayer Angel and play Sphinx of Jwar Isle instead!” then that would definitely change the demand [for Baneslayer] (and given the amount of Jund around, that might not be the worst idea!) That could happen, but I wouldn’t count on it just yet. On a side note, you may want to pick up Sphinx of Jwar Isle just in case.” —Jeremy Fuentes
If you follow the link you’ll see this blurb:
“Interesting to note – Star City bumped up their price on Sphinx of Jwar Isle recently, to $4. Some other sites are starting to charge real money for Sphinx too. Most sites that had listed the rare under a dollar are already sold out, and eBay prices are starting to perk up too. Sphinx of Jwar Isle may not be the next Baneslayer, but it’s better than a junk rare. Pick yours up before you have to actually trade something valuable for them.”
EDIT: Another vote for Sphinx of Jwar Isle, this time from blogger Russell Tassicker of Gwafa’s Bazaar:
“Sphinx of Jwar Isle: Buy. This guy is creeping into more and more netdecks from such well respected deckbuilders and writers as Patrick Chapin and Conley Woods. I expect the price to gradually rise, and if he is a hit at Worlds then the price will shoot up. Blue is also extremely weak at the moment but if Worldwake brings some goodies this guy will find a good deck to fit in.”
Take a look at Russell’s blog (link added to sidebar); if you’re interested in the trading/financial aspect of Magic, it’s another good source for information.