Ahead of Modern season, prices on staple cards have yet to settle. Looking over the card lists on MTG Salvation forums for potential spec targets may seem a bit obvious, but with players unable to settle on a price for their Modern must-haves I see a wishlist with plenty of room for profit.
Vengevine is going to make a splash in Modern. Two days ago single copies were selling on ebay for around $15. Interestingly, most were being snatched up via BIN auctions at $15 with no shipping. Meanwhile, playsets at the time were not always finding bidders even with free shipping and pricing less than $15 per Vengevine. Today, prices have drifted up to about $18 a card. That is slightly higher than the lowest TCG pricing (around $17). Here an auction set to end 9am EST Dec 11th already has bids for a playset valuing each card at $17.88. Meanwhile, TCG is still loaded with copies from gold star sellers at $18.
Modern Dredge calls for this as a 4-of and this archetype remains a popular choice among new and old players. Because Dredge decks have appeal across formats many dredge pieces make stable investments for MtG speculation. Bloodghast is selling on Ebay for about $4 a pop. This represents another recent price increase as TCG had copies available a month ago for less than $3. Bloodghast will always get attention in a binder if you've an MtG crowd playing something other than (or in addition to) Standard. This is easy to trade at $5 and has some great upside leading into the next Modern season.
If Birthing Pod is going to be a thing, than $2 is too cheap for Razorverge Thicket. Most Modern Pod decks are going to run 4 copies of Thicket and sucking up copies today in trade, even buying old M13 event decks at retail makes sense. Fastlands are going to be in demand because they keep tempo and in a format where combo is a real threat, having usable mana on turn one matters.
Ever hear the one about how multiple reprints destroy value? I hope you didn't let that maxim keep you from picking up Birds of Paradise on the cheap as they left standard. Birds are going to be very comfortable in any Modern Birthing Pod deck, and will remain in demand anytime someone is trying to rush into mid-game. Buying Birds of Paradise for less than $4 is too hard considering how little the average trader is going to value them. Pick them up on the cheap. They are likely to return to Standard sometime and will continue to find a home in enough formats to justify an investment.
Go take a look at all the Infect variants in Modern. Don't you feel like, maybe Inkmoth Nexus should be worth at least as much as Blinkmoth Nexus? That represents a potential doubling of value for Inkmoth. Here is another card that, like Vengevine, is pricing out slightly higher than TCG on Ebay. That is probably a bullish indicator for both cards and a good reason for you to test a retailer's willingness to fill your spec order.
Infect is a tough deck to make further specs on. Mutagenic Growth could be a long term value play assuming you can grab copies on the cheap. Creeping Corrosion, which should be a sideboard card in Infect to deal with Affinity, might creep up in value if it becomes popular in other side boards. Still, an investment in Infect probably starts and ends with the Nexus. At least, I can't think of anything representing that combo of value and upside.
How About Jund?
Lotus Cobra has a chance to impact the Modern format's most consistent performer: Jund. Presently copies can be had on Ebay for about $4.50 and that price is just half a buck under listed NM TCG pricing. Looks like people have noticed the extra speed the Cobra gives lists can lift Jund past more aggressive decks. Probably a good pick up as this mythic and the set in general seem to get harder to find.
Liliana of the Veil looks like an interesting play if you are a fan of putting money into Jund. This is one of my favorite planeswalkers ever, but at today's prices she seems fully valued. I admit, I thought the same about Thundermaw Hellkite at $30. That said, Liliana is being bought up on Ebay BIN auctions for under $20 including shipping. I'd trade into more Liliana at 18ish all day, but if I am buying Jund - I'll gamble with the Cobra.