Check out magic.wizards.com for more info on how to play
This site also serves as a mostly proper set editor
Iconic Cards: Tarmogoyf, Dark Confidant, Lightning Bolt, Birds of Paradise, Liliana of the Veil Popular Decks: Abzan Junk, The Rock, Jund, Superfriends 4 Tempo Tempo decks aim to stay one step ahead of their opponents by ruining the opponents plan
Counters can't be put on artifacts, creatures, enchantments, or lands
Legendary cards tend to be more powerful, so the legend rule prevents games from getting out of hand
There are some awesome character creation additions that Im in love with, including races like centaur, minotaur, and satyr, a new bard and paladin subclass, and supernatural gifts (my favorite)