With the printing of Modern Masters 2017, there will be plenty of cards often played in the Modern format that will see huge drops in price due to their being reprinted in the set. One of the cards that will obviously not be in Modern Masters 2017 is Matter Reshaper. This rare creature from Oath of the Gatewatch is probably one of the more underrated Eldrazi, in my opinion. Sure, he sees a good amount of play in a variety of Modern and Legacy Eldrazi decks. But with many copies still available under $2.50 as of October 2017, he's rather underpriced for an Eternal playable.

The Matter Reshaper only costs 3 mana to cost, but one of those must be a true "colorless" mana. In Eldrazi decks, this is really never going to be a problem. Best of all, when the Reshaper dies, he either puts a free permanent onto the battlefield or draws you a card. Either way, he can easily replace himself. Sure, if he gets exiled by a Path to Exile or Swords to Plowshares, you won't get the ability. But more often that not, you'll make sure that he dies. Keep in mind that he can also put a land into play, which is a nice gain in tempo.

Matter Reshaper was $6 in February 2016 at the height of his popularity. After dropping considerably in price, he was still $4 back in July & August 2016. But then, after basically disappearing from Standard play completely, his price cratered. However, in early March 2017 there was a mini price-spike to about $2.50, and after a slight dip afterwards back under $2, he's been on a slow, but steady rise again.

As part of a smaller set that was opened a lot, there are a lot of copies out there. But in a couple of years, with his consistent play in Modern, he could easily be a $4-5 card again. This is a card I definitely want a play-set of on-hand. Eldrazi is his best deck, and while you never know where else he may pop up, that's an archetype that's not going anywhere.

Oblivion Sower is a pretty good Eldrazi. At one time, the 6-mana creature was well over $8 a copy. Nowadays, you can find copies of  Oblivion Sower for just over $1. He's been long forgotten in Standard, and related to the sideboard of Modern Eldrazi Tron decks.

But in Legacy, he's been seen as a four-of in a tournament winning Eldrazi deck. He also sees a good amount of play in Commander. EDHREC has Oblivion Sower listed in over 2800 decks. Still, with a Duel Deck foil printing, there are a lot of copies out there in the wild.

Legacy demand alone won't drive this card in the way that the format used to, but it's so widely usable in Commander that copies will always be selling. But, if a Modern deck happens to win a major event with multiple copies in the 75, it's likely this card could end up spiking in price.

If a price spike doesn't happen ever again for Oblivion Sower, it's hard to see this card ever being worth less than $1. So if you need your copies, now is as good a time as any to pick up Oblivion Sower.