Your search for "Key Mace #2 WP11-EN005" revealed the following:
Key Mace #2 - WP11-EN005 - Super Rare from World Championship 2011 Card Pack, available at 401 Games Canada. Rarity: Super Rare Card Text:This fiend brings out the worst in everyone.
Key Mace #2 - WCPP-EN005 - Rare from World Championship 2010 Card Pack, available at 401 Games Canada. Rarity: Rare Card Text:This fiend brings out the worst in everyone.
Key Mace - WP11-EN002 - Super Rare from World Championship 2011 Card Pack, available at 401 Games Canada. Rarity: Super Rare Card Text:Enemies' hearts will melt at the sight of this small fairy's cuteness.