Just in time for the Prerelease this weekend, I made a list of every rare and mythic rare from Amonkhet with recommendations for buying or selling it at its current price. Due to limited space, I only offer explanations for the more relevant cards (including all the mythics), but I still categorize the rest and will respond in the comments section if you have questions about a card I did not offer an explanation for. Let's start with the cards I would buy now.
This card feels like a bargain at its current price of $14. I was expecting to see it somewhere in the $20 range since that's usually what single-color planeswalkers start at when they are as obviously good as this one is. I would expect her to settle around $15-18, but even in that scenario we're talking about a small return on our investment. She will see play and you won't regret your $14 investment.
At $3.50 this is currently the lowest-priced god, but it's my pick to be the best of the five. It's possible that all five are overpriced, but if any are worth the investment, I believe it's this one. It only costs three mana, it pressures planeswalkers with pseudo-evasion, and it offers direct damage with the Drain Life ability.
I'm buying at $2.50 since I expect this card to be one of the defining threats in Standard. It doesn't have a lot to compete with and conveniently answers a lot of important cards in Standard, most notably both Gideons.
I'm buying at $2 because even if it doesn't pan out, everyone and their mother will try it. All it will take is a single 5-0 deck list or SCG Top 8 for everyone to go bonkers and want to build the deck. And of course they will need all four copies of the card since it is a build-around. Also how cool would it be to play Magic with your own mother? I'm buying!
This is basically Jace's Ingenuity that scales in either direction at the reasonably small price of discarding a card. Being an instant makes this infinitely better than Mind Spring. I suspect this will be a quiet all-star and Andrew Cuneo will Top 8 (or win) the Pro Tour with it. Buying at $1.75.
I'm definitely buying at $1.50. This card already sees play in Legacy and Modern, so even if it sees no play in Standard (unlikely), it will still go up from $1.50 by this time next year. Long-term investment that is very likely to pan out.
At just $1 I see this at least doubling in price. It's great against weenie strategies and can be cycled away (albeit at a hefty three mana) against non-weenie strategies. Even without cycling I would pick this to be worth more than $1.
At $.90 I expect this one to rise. It's an auto-include in any Drake Haven deck and the cycle cost is so low it will see play elsewhere. It evades and hits for four, which is perfect for combating Gideon and other planeswalkers.
It doesn't take much to exceed a starting price of $.35 and I think this one will do it. It's a strong win condition in control decks that don't want to play any creatures and Aetherworks Marvel is a good way to find it since it conveniently digs through six of the seven cards. You must cast the second copy from hand, but getting to seven mana shouldn't be all that hard.
Ok, I'm buying the cat lord at $.35. It's unlikely to see play over Archangel Avacyn or even over Angel of Sanctions, but I feel like I would not be living up to the Brimaz4Life title if I sold on this card. I hope to someday play this card and Brimaz, King of Oreskos in the same deck. Maybe in a cube draft?
Buying at $.25 because it's a Minotaur lord and will therefore be sought after casually. If it sees any Constructed play, that's a bonus!
I'm definitely buying this one at $.25. Clone effects are hit or miss and I think this one is a solid hit. What's better than getting two Clones for the price of one? How about only paying a quarter!
At $.20 I'm calling this a low-demand sleeper pick. Maybe I'm biased due to me affinity for the Selesnya guild, but it doesn't seem all that hard to turn this into a two-for-one with added lifelink value. Without much room to fall and plenty to rise, this one is a good small investment to make.
I think Nissa is pretty good, but $16 for a two-color planeswalker has a history of being a bad idea. Remember that time when a Simic planeswalker went up from $16? Yeah, me neither. It's cool that you can just play her out into an open board on the third turn for good value or by tapping out later in the game for much more value. She scales well, but too narrow to be worth the heavy investment. Trade these for Liliana, Death's Majesty if you can.
I have played a lot more with Aether Vial than most people and let me tell you, if I could have a turn three Aether Vial every game I would decline the offer. The reason Vial is so good is because it can be played on the first turn. Yes, I understand that the spells are free and you can play a spell on your turn and on the opponent's turn, but the floor on this card is so low and will come up a high amount of the time. It doesn't impact the board for a few turns, it takes up a crucial third turn, and is absolutely abysmal at any point other than turn three. Others seem excited about this card, but I'm calling it a complete failure and willing to own up to being wrong if that's how things pan out. $12.75? I'm selling this one like it's stock in United Airlines.
I think this is one of the better gods and it's pretty easy to turn on as long as you have another creature and some mana available, but a 5/5 for 2G is not really even that much of a discount. The fact that it won't usually be turned on to block the turn you cast it means this likely won't be more than a two-of in decks that can support it. I think Rhonas will see some play, but not $10 worth of play.
The card is powerful and I expect it to see play, but I think $5.50 is a bit high for this card, mostly because it's multicolor and really has to be Naya to get full value. Andrejs Prost summed up my reaction to this card perfectly when he said it "looks like one of those cards a computer randomly generated." RoboRosewater or not, the card will see some play.
I think people want this to be Thassa, God of the Sea. It is not. Turning on Kefnet is much harder. Get rid of these while they are still $5.
I think this god is playable, but I'm selling at $4.25. This will only fit into one style of deck and there are other comparable options even for that one deck. The odds are stacked against Hazoret's success.
If there is some reusable stifle effect this could be good, but as is it is very hard to make it good. If you're a glutton for variance, this could be a card worth experimenting with, but I doubt it will see competitive play. Selling at $4.
Heliod, God of the Sun was terrible and Oketra looks very similar with little upside. Sell at $3.75.
I'm selling at $3. It may see some minor amount of play, but not enough to be worth an investment.
I'm selling at $2.50. In another format this card would be good, but Walking Ballista runs these streets and one-toughness two-drops lost a ton of value. I predict that Servant of the Conduit is better than this card even in decks that have no other way of producing energy.
It might see play, but I'm not holding my breath, at least not for $2. I think it will get outshined by Vizier of the Menagerie.
The front half is sorcery speed, so it's easy to see coming, and an overpriced Shock is low impact later in the game. I'm definitely selling at $1.50!
I could see this making its way into a tournament deck, but I don't see it living up to $1.50. It would take a LOT for me to play this over Chandra, Torch of Defiance.
It's appropriately valued as the lowest demand mythic, but I'm still selling at $.69.
Bounty of the Luxa
Rags // Riches
Mouth // Feed
It's the most expensive card in the set at $25, but it might also be the best! In all likelihood it will probably drop to around $20 or maybe even $15, but I suspect it will see a lot of play and will remain a premier mythic. The biggest downside is having the same name as Gideon, Ally of Zendikar, but I think it's good enough to overcome this tension. It's essentially a Thopter Arrest / Loxodon Hierarch hybrid. What more is there to love?
At $7.50 it's the most expensive non-mythic rare in the set, so it is destined to drop some amount in the short term, but I expect it to likely pick back up as time goes on. If you need it now, go ahead and buy it and hold onto it long after rotation. If you don't need it right away, then you're likely safe to wait as I expect it to likely drop to $5 by this time next month.
I was prepared to buy this at $5, but $6.50 is about where I would put it. I could see it going over $10 if it finds a home and takes off, but I could also see it settling at $3-4 if it never finds a home or gets outshined by another card at the same spot in the curve. This cards provides a similar value that Courser of Kruphix used to provide and I think the chances of it taking off are at least as good as its chances of not.
Currently at $4.50, I could see this one going either way. The card is powerful, but it competes with Archangel Avacyn for a similar role and Avacyn is one of the defining cards of Standard. No matter how good you are, if you're Aaron Rodgers' backup you might not get the playing time you deserve. Keep an eye on this one's price when Archangel Avacyn rotates.
I'm buying all these at $3 each, but only because I play a lot of Standard. The price will likely fluctuate between $2 and $5 depending on which decks are popular at the moment. They're unlikely to see play outside of Standard except maybe in a dedicated cycling deck involving Life from the Loam, but they'll see plenty of play in Standard. If you play Standard, buy your play set. Otherwise ignore them and move on.
I like this card a lot as it is one of the few one-drops that cannot be traded for a single counter from Walking Ballista. It is not hard to make it attack for 2-3 points of damage a turn due to prowess and its wither ability makes it great in conjunction with burn spells. I suspect it will fit perfectly into an Izzet aggro deck with a heavy burn package. Still $2.50 is kind of high for a rare, so this one is a push.
Archfiend of Ifnir
Temmet, Vizier of Naktamun
Heaven // Earth
Cut // Ribbons
Failure // Comply
Hapatra, Vizier of Poisons
Throne of the God-Pharaoh
Dusk // Dawn
Commit // Memory
Never // Return
Pyramid of the Pantheon
Shadow of the Grave
Questions will be responded to in the comments section below. Happy investing and trading at your prerelease!