In case you haven't gotten the memo, emerge is kind of a busted mechanic. Both Elder Deep-Fiend and Distended Mindbender are looking to be among the best cards in Eldritch Moon, and they will change the way that Standard decks are constructed.

Gerry Thompson and Michael Majors have been working on an Izzet Emerge deck that utilizes these new monsters to trigger Kozilek's Return, which is arguably set for a jump in price at a mere $5. These decks take advantage of Matter Reshaper(a card that is currently climbing in price) as a value creature to sacrifice and K-Return to kill all opposing creatures as you beat down with your giant monsters.

While I don't know that the K-Return build of emerge will be the best build, I can assure you that decks focused on emerge creatures will be real. The colors and specifics have some kinks that need to be worked out though. Sam Black posted a Simic build featuring Elder Deep-Fiend, and the interaction in common between these lists and others is that of discount fatties and Sanctum of Ugin.

Sanctums are under a buck right now, and it's very likely that the card starts seeing significant Standard play. It also has earned a slot as a two-of in Modern Tron. Expeditions have really hurt the value of Battle for Zendikar rares, though at under a buck I imagine this one will at least be tripling in price before long.