They slot well into any deck that can play Gruul colors, and act as a self-recurring card drawing engine
It's willing to pay any price to win, liberally spending life and sacrificing minions to gain the advantage, as well as directly destroying enemy creatures
Multiform Wonder might have been decent back in Magics Morphling era, but creatures are so much better now
Partner (You can have two commanders if both have partner.) Once a creature with toughness 2 or less has blocked this creature, changing the toughness of the blocking creature won't cause this creature to become unblocked
The Grinder is between Fable and Valakut Awakening in terms of power, and its closer to Fable than youre going to think
This strategy fits well with sacrificial cards like Sakura-Tribe Elder or effects that focus on cards leaving the graveyard like Willow Geist