Typically, a draft in Magic: The Gathering requires three booster packs per player.
A Magic: The Gathering booster box usually contains 36 packs.
I presume that you mean tournament packs. If so they are random.
There are several ways to acquire Magic: The Gathering Arena packs, including purchasing them with in-game currency or real money, participating in events and tournaments, completing daily quests, and earning rewards through the game's progression system.
Magic The Gathering Tactics can be downloaded directly from the website and doesn't require a purchase. However, you'll need to buy the packs in order to create powerful decks
The six-card packs are about a dollar, the 15-card packs are about three dollars, the intro packs are about twelve dollars, and any pack bigger than that ranges from twenty to thirty dollars.
Well yeah, but you would have less playables and it would be harder to make a 40 card deck, and a 30 card deck would be pretty small to play with. (and your friends would think you're cheap) You might as well play Pack Wars or save up until you have enough for a real draft.
A draft booster box typically contains 36 packs.
There are a variety of starter packs, depending on what you want to do you can choose from any of them. Green is a very popular one and a somewhat strong starter deck.
The Magic: The Gathering 2015 Core Set Deck Builder's Toolkit includes 125 semi-randomized cards, four 15-card booster packs from recent Magic sets, 100 basic land cards, a deck builder's guide, and a reusable card storage box.
In a Magic: The Gathering tournament, 2HG Sealed rules require each team to build two decks using six booster packs. Each team shares a life total of 30 and takes turns playing together against another team.
Older (pre-Shards of Alara) 60-card theme decks don't. Newer 40-card 'Intro Packs' do.
The Magic: The Gathering 2015 Core Set Deck Builder's Toolkit includes 125 semi-randomized cards, four 15-card booster packs from recent sets, 100 basic land cards, a deck builder's guide, and a storage box.