Decks that can run Blood Moon effectively will probably be one or two colors at most
As the first mode is performed, first the player whose turn it is chooses two cards in hand without revealing them, then each other player in turn order does the same
As a creature with Daybound, when it becomes night, Brutal Cathar becomes the Moonrage Brute, a red 3/3 with first strike and a ward cost of three life
Gem packs are China's miniature boosters that contain only four cards, with one guaranteed rare or better
Second, while Legends cards are generally pretty expensive, collectors boosters will contain cards of all rarities, which means even if you're lucky enough to be in the 3%, you'll likely pull a common (most of which are worth between bulk and $3)