conceptualizing noSQL... using Magic the Gathering - json

Question

So, I've been using SQL for ever. It's all I know, really, but I really want to understand how to conceptualize document data.
{
"MBS":{
"name":"Mirrodin Besieged",
"code":"MBS",
"releaseDate":"2011-02-04",
"border":"black",
"type":"expansion",
"block":"Scars of Mirrodin",
"cards":[
{"layout":"normal",
"type":"Creature — Human Knight",
"types":["Creature"],
"colors":["White"],
"multiverseid":214064,
"name":"Hero of Bladehold",
"subtypes":["Human", "Knight"],
"cmc":4,
"rarity":"Mythic Rare",
"artist":"Austin Hsu",
"power":"3",
"toughness":"4",
"manaCost":"{2}{W}{W}",
"text":"Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)\n\nWhenever Hero of Bladehold attacks, put two 1/1 white Soldier creature tokens onto the battlefield tapped and attacking.",
"number":"8",
"watermark":"Mirran",
"rulings":[
{"date":"2011-06-01", "text":"Whenever Hero of Bladehold attacks, both abilities will trigger. You can put them onto the stack in any order. If the token-creating ability resolves first, the tokens each get +1/+0 until end of turn from the battle cry ability."},
{"date":"2011-06-01", "text":"You choose which opponent or planeswalker an opponent controls that each token is attacking when it is put onto the battlefield."},
{"date":"2011-06-01", "text":"Although the tokens are attacking, they never were declared as attacking creatures (for purposes of abilities that trigger whenever a creature attacks, for example)."}
],
"imageName":"hero of bladehold",
"foreignNames":[
{"language":"Chinese Traditional", "name":"銳鋒城塞勇士"},
{"language":"Chinese Simplified", "name":"锐锋城塞勇士"},
{"language":"French", "name":"Héroïne de Fortcoutel"},
{"language":"German", "name":"Held der Klingenfeste"},
{"language":"Italian", "name":"Eroina di Rifugio delle Lame"},
{"language":"Japanese", "name":"刃砦の英雄"},
{"language":"Portuguese (Brazil)", "name":"Herói de Bladehold"},
{"language":"Russian", "name":"Герой Блэйдхолда"},
{"language":"Spanish", "name":"Héroe de Fortaleza del Filo"}
],
"printings":["Mirrodin Besieged"]},
{next card...},
{next card...},
{next card...},
{last card...}
]
},
{next set...},
{next set...},
{last set...}
}
So, I have a json file of all of the cards from Magic: The Gathering. The json is 'segmented' into the different sets. So, if I were to import this somehow into a noSQL database (mongoDB):
what would constitute a document?
Is each set a document?
Is each card a document?
What would be a good structure?
How does the querying work at that point... is it just a giant 'text search' if I'm looking for something?
Just looking for some sort of insight to wrap my head around noSQL.