I would suggest that counting Chronicles separately from Fourth Edition makes no more sense than does counting Alpha and Beta as separate sets. It was packaged in different packs, but was considered to be an extension of Fourth Edition, and was legal everywhere (and everywhen) Fourth Edition was; it didn't occupy an "expansion" slot in Type 2, and it rotated along with Fourth Edition when Fifth Edition came out. It should probably not count.

I agree that counting Chronicles seems odd. Thoughts?

I personally want to count Alpha and Beta as separate from unlimited so that War of the Spark is the 100th set, since this feels like a great event for such an occasion.

1) They’re not.2) If you count them separately, it makes Core 2020 the hundredth (assuming the counting was correct).

Did you watch the beta draft from GP Vegas? Were you surprised by the community's excitement for it?

I was right at the table as it was being drafted. I expected it to generate a lot of excitement. It’s a Beta Draft!

I was really excited months ago when Arena was first introduced, and put my name in to get into the Beta! Just got my email saying I could get it, but turns out I don’t use Windows. Do you have any clue as to when or if the devs are planning on making Arena for more platforms?

I don’t know the timeline, but I know it’s in the plans.

Which sets has Richard Garfield worked on?

Limited Edition (Alpha/Beta), Arabian Nights, Tempest, Odyssey, Judgment, Ravnica, Innistrad, Dominaria. He is credited on Urza’s Saga and Torment as mechanics he made premiered in them.

If Volcanic Island COULD be printed in Masters 25, would you give it a different Watermark then the cards that were available in Alpha, as the first printing for Volcanic Island was Beta?

Alpha and Beta are just the first and second printing of Limited Edition. We don’t differentiate between first and second printings of any other product.

Richard Garfield designed Alpha to be played with a starter deck and maybe a couple of boosters. That seems really close to a sealed pool. What's the difference between that and sealed?

If you’ve ever played limited with Alpha/Beta/Unlimited (and I have), it becomes apparent very quickly, it wasn’t designed for limited. While there is overlap with casual constructed, they are different animals.

Hello Mark! It's my birthday tomorrow but I'm too excited so I hope it's okay I ask now :) what is your favorite individual card design (or designs) from Alpha/Beta/Unlimited and why?

There’s so many great cards, so my answer would change on a different day. Today I choose Giant Growth. It’s flavorful, simple, creates great gameplay and we can still reprint it.Happy Birthday!

"We don’t tend to change the cards in future printings of the same set. When we did it in early Magic, it caused all sorts of confusion." When did that happen in early Magic? And, isn't this a pretty egregious functional change/errata? Again, I don't have the info, but what are the benefits of not changing and how do they outweigh the cons?

There were twenty plus printing changes between Alpha and Beta. We’re a collectible so when we change things, it makes a different collectible item. When we do too much of that it upsets people.

Mark. I shave the up most question to ask. You can PM your answer, or simply reply in public. Do SEALED ALPHA/BETA boxes exist? I have a friend who is sceptical that they never have simply because of how they were used as demonstration pieces in packs. I'm a firm believer that you, Mr. Garfield, his co-designer in the beginning(forget his name), and WotC President/CEO are the FEW that would have one. What say you, oh wise one?

They do exist. I have owned some in the past.