The Avengers Set introduced a number of changes to the World of HeroClix.
Most notable is the introduction of a new rarity system and the 65 visually different figures. The REV rings on the dials have been removed and placed on the new Cards.
The cards themselves are a new feature; they match up with a figure that is pulled from a Booster Pack. On the two-sided cards are displayed the powers that the figure has, as well as detailed information on the new Special Powers that are "Unique" to that Character. The Card also displays the figure’s Team Ability (If it has one), set, collector number, Experience Level, a small image of that Figure, the Point Value of that Figure, as well as a bit of background information about the character, and his/her/its first comic appearance on the back of the card.
The rarity of a figure is displayed on a tab located under the set icon on the figure’s base. There are four (4) rarity levels. They include Common (White Tab), Uncommon (Green Tab), Rare (Silver Tab), and Super-Rare (Gold Tab). The Limited Edition rarity level has been used for the four (4) Heralds from the Coming of Galactus event. Limited Edition figures in subsequent sets continuesd in the tradition of simple remade figures like those from past sets. An additional set of Limited Edition Heralds were prodiced as Judge rewards for those who hosted the 5-week “Coming of Galactus” the first in a series of structured tournaments, leading up to a big final week prize.
The set also introduced the Duo Character and reintroduced Giants into boosters. This was the first expansion to have Giant Characters since Fantastic Forces.Other firsts include a Flying Giant Character. (Dragon Man)