MTG Commander Collection Green - WPN Regular Exclusive - Rules of Play says:

Commander Collection: Green is a boxed set of eight reprinted cards themed to one color and what it does best - in this case green, the color of big mana and big creatures! These cards have been selected to showcase the things green mages love to do in Commander, and each one has been given brand-new art with loads of references to popular legendary characters. They'll be right at home in your favorite green deck alongside their legendary counterparts!