For one, it is larger than Beta
Arlinn, Voice of the Pack and Raised by Wolves keep your wolves coming, while Camaraderie and Second Harvest ensure you draw cards and multiply your army for the final push
Because each color has a distinct playstyle, its a good way of learning what you prefer
Each Background synergises better with a specific legendary creature than others, such as Scion of Halasters ability to put cards into your graveyard working perfectly with Viconia, Drow Apostate and her requirement of having four or more creatures in your graveyard
If the only card in all graveyards is a single artifact creature card, Polygoyf will be a 2/3
For two black mana, you can destroy any target creature without the worry of it coming back through regeneration