This particular Kodama gives you the ability to put multiple permanents into play for free, and thats the kind of thing were very much here for
Polukranos has a higher ceiling since it is great as a mana sink, but investing an entire turn into its monstrous ability has the potential to backfire in the face of interaction
This artifact has a fun story attached to it, too: Originally, Skullclamp was designed to give a +1/+1 buff, but before seeing print the Magic designers thought that such a buff would make Skullclamp too powerful and they changed it to +1/-1
Its even a sweet place to use Blood for the Blood God
Its not uncommon for red commanders such as Krenko, Mob Boss to have a stray Goblin Recruiter or Dockside Extortionist around to sacrifice and pay the cost for this spell, but the place where it will shine the most is in partner decks including Rograkh, Son of Rohgahh