With the printing of Sram, Senior Edificer, some people are excited to play "Cheerios" in Modern. It's a combo deck that has existed though has never been terribly competitive for some time that wins by casting a lot of 0-mana equipment and drawing tons of cards. It has consistency issues, and was seriously vulnerable, though Sram at least gives you eight copies of Puresteel Paladin.
Make no mistake- this deck loses to removal, counterspells, discard, and even slight gusts of wind. It's just a cool thing with a casual following. The hype around Sram has caused Puresteel Paladin to jump from $5 to $10+, though I wouldn't be concerned about not owning these as a Modern player.
I don't expect any further immediate growth on this card, and would expect more copies to be put up for sale with the new inflated price point. Now is a great time to sell before too many Modern tournaments occur and the deck continues to do nothing of note.