With Foundations making Nyx frames on Enchantments the standard, how will that combine with Enchantments that have other distinguishing frames, like Snow or Devoid? The Nyx effect is a bit different from the 'base grey' of Artifacts.

We have talented graphic design people.

Modern horizons 3 is interesting to me in that three of the major mechanics in the set were once considered failed or problematic mechanics. Kindred was considered a failure almost immediately after lorwyn and was abandoned. It was meant to be a card type and you now have a defunct card type. You used kindred not only in the tarmogoyf deck but also in a different way as an identifier in the eldrazi deck. Energy was awesome flavor wise and was a success but you failed to balance it mechanically and you had to ban several cards and because of that it seems you hesitated to return to this mechanic in standard. Finally devoid was considered a do nothing mechanic that was not popular. You used all three of these mechanics in modern horizons 3 but they are a big success. What has changed? Is it the execution? Is it experience? Why use these mechanics for such a high profile set knowing their history? Does this give hope for other mechanics that were not popular to return

First, energy was quite popular, the highest scoring mechanic in Kaladesh. Yes, a bunch of cards ended up being too strong, but that means a lot of people played with it.Second, Kindred (formerly tribal) wasn’t unpopular. Our issue with it was it led to a slippery slope where we added a lot of words on cards for little effect. Players have asked for its return.Third, devoid was unpopular, but I think we just positioned it wrong. We made it a mechanic that didn’t do anything which upset people. Had we made it a supertype, I don’t think anyone would have blinked at it.So what happened in Modern Horizons III?We brought back energy, a popular mechanic that players have been begging us to bring back for years. We brought back Kindred (renamed), but that’s not a big element of the set. Again, it’s something players have been asking for.We brought back devoid because we were doing Eldrazi, which was much more popular than devoid. I don’t think devoid is why the Eldrazi theme is popular. The Eldrazi are why the Eldrazi theme is popular. Devoid is just a callback, one we need to make the theme work mechanically.

Why isn't Selective Obliteration a Kindred Sorcery- Eldrazi? Its a colorless Eldrazi flavored card without devoid. I thought for MH3 (and its commander set) the Eldrazi flavor cards would either be devoid or eldrazi . Thank you for asnwering our questions sir.

There are three colorless instants and sorceries with colorless mana costs in the Modern Horizons III Commander decks. One has Kindred Eldrazi (Eldritch Immunity) and the other two (Eldrazi Confluence & Selective Obliteration) don’t, meaning Eldritch Immunity is the outlier, not Selective Obliteration. I’m not sure why one was Kindred and the other two not. It does demonstrate the slippery slope that discourages us from using Kindred often.

Just a bit of feedback. As someone who was critical of Devoid, I really like the MH3 cards that couple Colorless mana costs with Devoid. It's a very cute combo.

Glad you liked it.

Can you comment on devoid as a mechanic - It seems to benefit the game more from a design angle than from a mechanical one. Is it because it affords you the ability to interesting cards in a restricted color identity?

Design and mechanical are the same thing. It’s useful because we’re limited with power level with generic costs. Adding color lets us make more powerful cards.

Does a card being "devoid" affect color pie allocation at all?

It does not. Pay red mana and you can do things in red’s slice of the color pie.

Maybe a bit of a silly question, but if Rise of the Eldrazi were made today would its six colored Eldrazi (Dread Drone, Rapacious One, Nest Invader, etc.):A) Stay the same (colored) B) Have DevoidC) Lose the colored pips and be fully colorless D) Not exist

We would most likely use b) and/or c).

If devoid was so unpopular and it is considered a failure why would you choose to reuse it such a large quantity in modern horizons? Did you try another solution?

The issue with devoid was it was done as a keyword, but doesn’t do anything. The negativity wasn’t to the play of the cards, but the means by how we defined it. That’s why I say, in retrospect, I’d have done it as a supertype. If players didn’t like playing with a particular mechanic, that’s a much different issue, and probably would keep us from bringing it back.Modern Horizons doesn’t invent new mechanics though. It’s about mixing and matching what already exists. We needed some Eldrazi to have colored costs and devoid was the tool we had in existence to do that.

Could we ever see devoid be errataed to be a super type? It seems like it would play nice as one

While I wish we had done that, here are no plans to errata it.

Would a 5 color commander with Annihilatior be a color break?

It wouldn’t be a color break. It could be a flavor break, but even then with devoid it would be fine.