/magic.wizards.com/en/game-info/products/card-set-archive
The next Magic the Gathering set is set 2 in the Zendikar block, called Worldwake.
You can not. They are not part of Magic the Gathering.
I would suggest that you go to the magic the gathering website and look up their gatherer function. There, you can look up all the blue and black elementals in magic history and finc the set that has the largest portion of them. Hope that helps.
This is the German/France/Italy equivalent of the Chronicles set.
There is a core set for Magic The Gathering is a card game. The cards all have meanings one of the meaning is to infect other players. To purchase the cards you can search online stores the price ranges from three dollars to over twenty for a larger set.
go to this site: http://www.mtgfanatic.com/Store/Magic/BasicSearch.aspx?CatID=3
If by best you mean most broken, then either Urza's Saga, Mirrodin, or Shadowmoor (that is by block not as much by set).
About US$125 in Very Good Condition
Arabian Nights,8th 7th 6th 5th edition,chronicles
On all magic cards from "Exodus" (circa 1999) to present, there is a small symbol at the bottom right of the illustration that signifies what set a magic card is from. The trick is being able to put a name to each different symbol.
It would be almost impossible to "guess" which card from the test Set was created first. I do remember reading somewhere that the original art for the card Heal was Spock and the Dwarven warriors card were the Dwarves from Snow White. Alpha was the first official printed set and as Air Elemental was the first card of that set technically that would be the first card.
Masters Edition is a set of cards exclusively released on MTGO (Magic: the Gathering Online). It contains only reprints of cards released in the physical card game. As of 5/4/2017, there are four Masters Edition sets that have been released.