Here I've touched on a few cards that I think the prices are more important to watch. Don't forget that Stoneforge Mystic will be dropping in price with the new event decks coming out I'd move them for $15 while(if) you can. The event decks will affect the prices of the cards they contain so watch the prices of the following as they might drop: Stoneforge Mystic(2), Kemba, Kha Regent, Mirrian Crusader, Puresteel Paladin, Bonehoard, Sword of Vengence and in the next deck: Putrefax(2), Green Sun Zenith, Inkmoth Nexus, Melira, Sylvok Outcast, Obstinate Baloth(2).
Birthing Pod R - SCG $3 > $2 - Even though I still feel this card is going to drop, having played against it I got to see how powerful it is. I can see the Splicer and this working together.
Blade Splicer R - SCG $1 > .10 - I don't think this card will be going anywhere fast enough for it to be picked up anything more than $1.
Chancellor of the Tangle R- SCG $1 < $3 - This card has really shown itself in fauna decks. It's powering out Fauna Shaman, Lotus Cobra, and Stoneforge Mystic. This card can make some powerful opening hands.
Hex Parasite R - SCG $3 = $3 - The card is as low as $3 will it drop farther? It might because your opponent never plays into this guy and if you drop him t1 you won't get anything extra out of him other than your opponents playing around him.
Myr Superion R - SCG $3 > $1 - This card will keep dropping because of how restrictive it is to play.
Phyrexian Metamorph R - SCG $3 = $3 - This card is right around where I predicted it at and I don't think it will be changing much in price. It's already found a few decks that are playing it and some are cute nothing ground breaking.
Puresteel Paladin R - SCG $5 > $3 - Being in the new event deck isn't going to help his price right now. He might go up after rotation and people play a lot more equipment.
Spellskite R - SCG $10 < $7 - Wow did this card explode! I didn't take into the account that it makes most red cards look silly especially if you just use the blue mana to redirect the spells. And when he isn't protecting you or your other permanents. He can pick up a sword and start beating.
Surgical Extraction R - SCG $8 > $5 - Down it goes like I'm predicting its an okay card but it costs a card slot which I'd rather be doing something more productive in the game with. If you play it your deck has to auto lose to a certain card to justify playing it and you have to be playing a way to get rid of the card before you can remove it.
Batterskull M - SCG $25 > $20 - I can still see this card dropping even though it packs a big punch against aggro decks. After rotation and stoneforge has left this card might actually get played in multiples. It's even see play now in multiples in fear of losing it.
Jin-Gitaxias, Core Augur M - SCG $3 = $3 - This guy still has the most powerful effects of all the Praetors and thus shouldn't be forgotten.
Karn Liberated M - SCG $25 > $20 And he fell like predicted but I think he has a little more room to fall before his price justifies his cost. He might see play after rotation.
Phyrexian Obliterator M - SCG $25 > $10 - I'm surprised this card hasn't dropped already maybe people aren't ready to give up the idea of MBC just yet.
Sheoldred, Whispering One M - SCG $3 = $3 This card hasn't made any apperances in a black deck and probably won't right now but that doesn't mean it needs to be ignored.
Sword of War and Peace M - SCG $25 > $15 - I was hoping this card would be better than just the protection abilities on it but I was wrong about that. It's still nothing to scoff at and can be very powerful just running past all those pesky birds.