Red in particular in the format tends to be pushing the pace, especially with the Red/White go wide builds, and Red Black reckless aggro, though Red/Blues spell aggro is no slouch either
Tarkir: Dragonstorm Collector Booster Box contents: 12 Tarkir: Dragonstorm Collector Boosters 15 Magic: The Gathering cards per Booster 9-11 Traditional Foil cards, 5 cards of rarity Rare or higher Each Collector booster may contain these cards: TDM 1276, 287419
Keep in mind that, though I was building this for a superfriends deck, the same tech can apply to a sliver deck, a scarecrows/changelings deck, or even the four-color decks coming out later this year (unless you're playing , in which case you'll have to make some larger adjustments)
To my amazement on receiving the packs from the guy who told me about this, he clearly hadn't actually used this tactic himself and the pulls were about what they should've been (more on that later)