The phenomenon of decks that only have one copy is a bizarre side effect of a world where color is so cheap that you can play this, Wrath of God, Cloudthresher, Jund Charm, and Rhox War Monk without even worrying that this might be pushing it
We won't rank them here, though, since they arent proper card-draw effects
We cannot just increase the number of successes in the population for both Threats (element #3) and Answers (element #4) without taking from somewhere else
Extremely low prices may indicate fake or damaged cards
In a big-mana deck like Hydra tribal, you can easily set that X to eight or higher, effectively ending the game on the spot as you cast up to eight enemy spells for free
I've heard many stories of stores ordering one type of booster and receiving another (which may be due to inventory issues rather than confusion)