Each Collector Booster contains 15 Magic: The Gathering cards and 1 traditional foil double-sided token, with a combination of 5 Rares and/or Mythic Rares, 25 Uncommons, 47 Commons, and 1 Land card
The first, Epic, will be more rare than Legendary cards but less rare than Enchanted
If you discard a card with madness to pay the cost of a spell or activated ability, that card's madness triggered ability (and the spell that card becomes, if you choose to cast it) will resolve before the spell or ability the discard paid for
Get ready for enters-the-battlefield overload
The more attacks you can deal extra damage on, the more Energy counters you'll have stocked up for later in the game
Theres a surprisingly small number of ways to just exile the top of their deck