Unlike roster collections, which all provide you with coin rewards, special collections are an assortment of players with some kind of thematic connection. The reward for finishing these collections can vary greatly, but is usually a legend card. Some special collections are made from the start of the season, while others will pop up for events or awards from time to time.
Legendary Lakers:X/7
Reward: Magic Johnson Legend card
Legendary Celtics:X/11
Reward: Larry Bird Legend card
Living Legends:X/11
Reward: Tim Duncan Living Legend card
Legends Collection:X/98
Reward: Michael Jordan Legend card
3 Point Shootout 2014:X/7
Reward: Reggie Miller Legend card and Ray Allen Living Legend card
Dunk Contest 2014:X/6
Reward: Vince Carter Living Legend card and Pete Maravich Legend card
Legendary Lakers:X/7
Reward: Magic Johnson Legend card
Legendary Celtics:X/11
Reward: Larry Bird Legend card
Living Legends:X/11
Reward: Tim Duncan Living Legend card
Legends Collection:X/98
Reward: Michael Jordan Legend card
3 Point Shootout 2014:X/7
Reward: Reggie Miller Legend card and Ray Allen Living Legend card
Dunk Contest 2014:X/6
Reward: Vince Carter Living Legend card and Pete Maravich Legend card