They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and may have colons in their reminder text
In a Two-Headed Giant game, each player on the attacking team is an attacking player
Free spells can fall into a number of categories, too
You can get boxes of each of the following pack types, and pay attention to how many packs come in each box since it changes as WotC sees fit
I expect this blue enchantment to see some play somewhere
Urza is a singular win condition for the decks that can play him, capable of stabilizing a players life total, drawing additional cards, removing opposing cards under opponents control, creating creatures, and even generating virtual mana by making additional artifacts cheaper to play