In recognition of the influence of Phyrexia, this set featured many Mirrored Pairs (different cards that shared an opposing effect) such as Peace Strider and Pierce Strider. This set also added Living Weapons, which allowed Equipment to come into play attached to a 0/0 creature, and Battle Cry.
Cards to look out for in this set include Tezzeret - Agent of Bolas, Mirran Crusader, Magnet Mine, Massacre Wurm, Bonehoard, Psychosis Crawler, Go for the Throat, and the utterly terrifying Blightsteel Colossus.
36 packs per box, each pack contains 16-Cards, 1 Rare/Mythic Rare (Mythic rares are approx. 1 in every 8 rares), 3 Uncommons, 10 Commons, 1 basic land, 1 Token/Tips & Tricks card.