1) Are planes spherical in nature? If not, do they have borders or go on infinite? Or is like a cartoon where you eventually emerge when exiting stage right on the left?
Some are, some not. Dominaria, for example, is a planet like plane. But there is no nessessity for that. Especially artificial planes are not bound to be spherical. The shape of the world depends on the natural laws of the plane.
2) What physics (if any) differ on any of the known planes?
The major stuff is essentially the same thoughout all planes due to storytelling. Can't really go crazy on world building if you want it to be immersive and also want to tell a story, all while having limited space to establish either on the cards (names, illustrations, flavor text, abilities, and creature types are pretty much all you can work with). So there's equal gravity, breathable air, standard weather, etc. everywhere. Also, planeswalkers would have a hard time if they had to adjust to radically different physics everytime. Smaller stuff includes the floating Isles in Zendikar and Serra's Realm, in Kamigawa everything is inhabited by a spirit, in Lorwyn the sun never sets while in Shadowmoor it never rises, etc.
3) Does society and technology advance on the plains (this is a "yes" assumption w/ Kamigawa: Neon Dynasty, but what about other planes)?
Sure. Innistrad had to adjust to the advent of vampires, then the disappearance of Avacyn, then had to adjust to the Eldrazi menace. Kaladesh is all about innovation. Ravnica had to reconstruct the relationship between the guilds after the Guildpact was broken. Dominaria's societies changed drastically after the Phyrexian invasion was pushed back, like how the Cabal seized power on Otaria. Etc.
4) Outside of the Phyrexian language, are there any other languages?
Yes. Though none are explicitly worked out to that degree. But you can glimpse a variety of different languages from flavor texts that are "translations" of common proverbs and sayings of various peoples.
5) Is there a concept of "space" and "planets" on the planes (outside of moons, of course)? Does space exploration come up?
Magic hasn't gone to space yet, far as I know. But nothing prohibits a plane consisting of several worlds within a vaster expanse. Kaldheim is pretty much that with its ten worlds connected through the World Tree.
6) Id Dominaria the original plane where all has it's beginning? If not, any planes older than Dominaria?
Dominaria is a nexus between a large number of planes. That's why older planeswalkers came through there often, it's one reason why the Phyrexians invaded the plane, and why the first stories where centered there. But the single origin it is not. It may not even be the oldest plane, if that concept even makes sense.
7) In Ulgrotha, there are vampires among different races (there is Irini Sengir, a Dwarf Vampire), so why hasn't Vampire (which is more of a dead/alive state, such as zombie, skeleton, fungus, etc...) been incorporated into other races yet (vampires have, for the longest time, been treated as a human affliction)?
That's most likely due to available card space, you can fit only so much text on the type line. And so far the benefits of having the vampire creature type along some other race kind creature type are minimal. If the space on the type line permits and it fits flavorwise, some non-human creatures can be vampires and another race. Examples include Mirri the Cursed, Vampiric Dragon, Vampire Hounds, Gifted Aetherborn, etc. But being a vampire usually matters far more than being of some other race, too.
Some are, some not. Dominaria, for example, is a planet like plane. But there is no nessessity for that. Especially artificial planes are not bound to be spherical. The shape of the world depends on the natural laws of the plane.
The major stuff is essentially the same thoughout all planes due to storytelling. Can't really go crazy on world building if you want it to be immersive and also want to tell a story, all while having limited space to establish either on the cards (names, illustrations, flavor text, abilities, and creature types are pretty much all you can work with). So there's equal gravity, breathable air, standard weather, etc. everywhere. Also, planeswalkers would have a hard time if they had to adjust to radically different physics everytime. Smaller stuff includes the floating Isles in Zendikar and Serra's Realm, in Kamigawa everything is inhabited by a spirit, in Lorwyn the sun never sets while in Shadowmoor it never rises, etc.
Sure. Innistrad had to adjust to the advent of vampires, then the disappearance of Avacyn, then had to adjust to the Eldrazi menace. Kaladesh is all about innovation. Ravnica had to reconstruct the relationship between the guilds after the Guildpact was broken. Dominaria's societies changed drastically after the Phyrexian invasion was pushed back, like how the Cabal seized power on Otaria. Etc.
Yes. Though none are explicitly worked out to that degree. But you can glimpse a variety of different languages from flavor texts that are "translations" of common proverbs and sayings of various peoples.
Magic hasn't gone to space yet, far as I know. But nothing prohibits a plane consisting of several worlds within a vaster expanse. Kaldheim is pretty much that with its ten worlds connected through the World Tree.
Dominaria is a nexus between a large number of planes. That's why older planeswalkers came through there often, it's one reason why the Phyrexians invaded the plane, and why the first stories where centered there. But the single origin it is not. It may not even be the oldest plane, if that concept even makes sense.
That's most likely due to available card space, you can fit only so much text on the type line. And so far the benefits of having the vampire creature type along some other race kind creature type are minimal. If the space on the type line permits and it fits flavorwise, some non-human creatures can be vampires and another race. Examples include Mirri the Cursed, Vampiric Dragon, Vampire Hounds, Gifted Aetherborn, etc. But being a vampire usually matters far more than being of some other race, too.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)