The green print in the bottom center of the card indicates this card is uncommon.

The uncommon term referrences the specefic card's overall rairity. The color coded system is based on the MMO, World of Warcraft. In the MMO, uncommon item's names appear printed in green. This is similar to the card game, where the name of the series the card is from is printed in the color representing its rairity. The green "Azeroth" along with the number indicate that this is an uncommon card. Common cards would have Azeroth appearing in white, with rare in blue and epic in purple. Orange is reserved for legendary.