The rosette pattern is one example
See how nasty this is
This first printing from Onslaught was hovering under $10 before the announcement, but spiked immediately to almost $50
(4/15/2013) If you want to encode the card with cipher onto a noncreature permanent such as a Keyrune that can turn into a creature, that permanent has to be a creature before the spell with cipher starts resolving
Some of the decks that contain expensive staples are a little more pricey (though they still work out as good value for the contents), but the rest of the decks are great pick-ups now
Lets start with the bad news first: five-drop creatures dont have a very long history of being Modern playable, especially in recent Modern, although cards like Primeval Titan, Omnath, Locus of Creation and Yawgmoth, Thran Physician show us that more expensive creature can see be Modern staples if they have a big enough immediate impact on the game