Ascended Heroes booster packs will not be sold in traditional Booster boxes, so look for them in specialty products
The mana value is the total amount of mana in that cost, regardless of color
Elements has several examples of this type, mostly in the Entropy element: Mutation causes the the target creature to die, turn into a mutant, or turn into a different, random creature with a random power
This makes centering issues easier to spot, therefore grading them a 10 is harder
While players are encouraged to collect cards and even trade them (well, " encourage " might be a bit strong of a word on the latter), there's no incentive to grind out wins against human opponents outside of the occasional Emblem event
A good Dimir deck controls, destroys, and uses trickery to allow for evasion or, making your opponents deck work against them