Speculation #7(prophet of kruphix)

This undervalued rare is amazing.It allows me to untap my land and creatures on your untap step as well as on mine.this means I can play my creatures on your end step and then on my turn they don't have summoning sickness.I can swing every turn and still have blockers on your opponents force of 1/1 prowess monks.The regular theros rare is about $1.50,But it should cap at about $7.50.but the promo should cap at $15 due to its shininess

Speculation #6 (Crackling Doom)

I think that this card is amazing removal in any format where you can play Mardu. This card can get rid of there biggest creatures on your opponents field for just three mana as well as damaging them for 2. I think it is a good pickup now at about a $1.50.I expect that the price will peak at about $5 and that is when you should sell them.

Speculation #5 (outpost siege)

This FateReforged rare The red siege is a good card in this standard meta.Its kahns ability is the same as Chandras 0,and the dragons ability gives synergy with the butcher ,Alesha, and bloodsoaked champion  by dealing extra damage  when you sac the champion to the Butcher. Another use for the siege is that if you don't have good draws you can use this card to go through your deck faster to get the cards you you need.Along with the crackling doom the price is a bout $1.50 but i predict like the frontier siege the one that did well at the first protour it will probably cap at about $3 and that is when I think that you should sell.  

Speculation #4 (Surrak Dragonclaw)

I think that the Khan of the Temur is good now in Temur aggro decks.He cant be countered makes all of your creatures uncounterable, and gives them trample making all of your big creatures better.Along with the bow of Nylea can give all of your creatures deathtouch and trample.I think that it is a good investments because it buffs your creatures in ways I have not seen before.The price is now sitting at about $2 but if there is a good Temur deck that scores high in a competitive event it will peak at $12 and that is when you should sell.

Speculation #3 (Alesha, Who Smiles at Death)

I think that this would be good in standard and maybe in modern.This three mana 3/2 is an amazing card when it attacks it can bring back a Monastery Swiftspear for two mana it will come in attacking this can create a combo with Butcher of the horde,Monastery Swiftspear,Bloodsoaked champion, and Alesha.By sacking the champion and the swiftspear to the butcher for vigilance and lifelink enter combat swing with the butcher and Alesha pay two mana to bring back the swiftspear attacking for nine damage and at the second main phase pay 2 more and bring back the champion repeat. I think that this would be a good investment for this standard season.

Speculation #2 (Medomai the Ageless)

I think that the mythic from the Theros block Medomai the Ageless will jump in price because it allows you to take an extra turn if it can deal combat damage.I think this would be good in standard U/W control along with Temporal Trespass  so you can keep your board superiority.While it does have a CMC of 6 that shouldn't be hard to achieve with the deck you would be playing this in.

speculation #1 (underworld Cerberus)

I think that the mythic from the Theros block Underworld Cerberus will jump in price due to the fact that it can completely shut down Sidisi whip,and delve strategies by making there graveyard become basically an exile zone.This card would go good in any Mardu midrange sideboard.Even in red,black aggro deck to stop those pesky whip and delve decks