Card predictions for Mythics! But first, let's look at the numbers!
ORI: 10 Mythics
BFZ: 10 Mythics
OTG: 7 Mythics
SOI: 10 Mythics
All sets have at least 1 per mono color. Origins had 2 per color and the second was the DF planeswalker. BFZ had 2 colorless mythics, and we'll look at Multicolor in a sec. In OTG, Conflux had 1 in Tazri and actual Colorless had 1 in Kozilik which is what I think the design team was going for. On to SOI and multicolor:
When looking at Multicolors, I've noticed that as a whole, they try to keep an even distribution of colors across the entire thing without regard for the rarity of the card. Looking at multicolor cards in BFZ, we see
on 4,
on 5, and
,
,
nd
on 6. As a as far as mythics go in BFZ, white had none,
nd
were on one each, and
nd
were on 2/3. Why did White get hosed? I don't know, they didn't even have more mono cards than any other color. Maybe the design team knew there would be two white mythics (technically) in OTG?
SOI has a pretty even distribution in the multicolor (fun fact: there are only rare and mythic multicolor in SOI and it's an even split) with 3 for
, 4 cards for
,
,
nd
, 5 for
.
has no multicolor mythics in SOI,
nd
have 2 each, and
nd
each have 3. I was kind of surprised blue had absolutely no Mythics, but hey they got
Fevered Visions and
Altered Ego. It's also possible that the design team knew that some fun multicolor mythics for blue (Gisa and Geralf / Tamiyo) would be coming up in EMN and judged accordingly.
That said, I think you cannot argue that there will be 1 mono color mythic for each color. Based on what we have spoiled so far (though maybe a little early to speculate as we still have some weeks) I'd have to say they are as follows:
Deploy the Gatewatch The Gatewatch is a major theme they are pushing right now, so it just makes sense to me. We know Gisela is going to be in the game, so she could fit this slot, I just think that due to her Meld mechanic, she will be considered a 'special' one like Tazri.
Mind's Dilation Really, only because it's the only one that's been spoiled. As much as I personally like this card, I'd much rather see a creature in the blue mythic slot this time.
Liliana, the Last HopeNeeds no explanation. This is pretty much 100% a sure thing.
Mirrorwing DragonAgain, just the only one that's been spoiled and it looks sick, so that might just be wishful thinking on my part.
Ishakanah, GrafwidowYeah... just the only one revealed. We don't even have really any spiders in Duels so I hope this isn't what we get, or that the tribe get some big support with this expansion.
So of those, only White and Black are what I'd put money on. At minimum we get 2 more for total of 7 or as much as 5 more for 10 total. I think at minimum we get Gisela and Emrakul since we know Gisela is in and Emrakul is the flagship antagonist for the set, and if they slot Gisela into the White slot, then it's definitely gonna be Tamiyo because everyone has a hard-on for planeswalkers apparently. If Tamiyo does get in, she'll be the first 3 color card in Duels.
On the subject of Decimator, I think it's almost definitely in but as a 'special' slot. Emerge is their major keyword for this expansion and there's probably going to be a suite of colorless creatures, one or two for each color.
If we get more... I'd say Gisa and Geralf are definitely in. They're popular characters and blue had no multicolor mythics in SOI. Plus, it would support the zombie tribe which is Innistrad's bread and butter. Ulrich is also a strong contender for a special slot since werewolves could use more support.