Drafting is... sketchy. It depends highly on the skill level of the people sitting at your table, and if any of them is money-drafting (drafting the most expensive cards to sell after). Aside from that, you need to know what cards are good in limited (hints: Removal, Bombs, reusable cards). Knowing this, from pick 4 onwards, you can have an idea of which color(S) might be open, so you can move into it if your initial color has dried up. It is also important to know this, because of what cards YOU will be passing on the first pack, which will USUALLY set people on those colors, meaning you won't be seeing cards of those colors on pack 2.