As Altar of Dementia and Ashnod's Altar have shown us, anything that allows instant-speed creature sacking opens the door to some pretty crazy combos. This is a combo-enabler that allows you to combo off itself later on, but at a price. I understand that if it just straight-up turned any sacrificed creature into a 2/2 artifact creature, it would be broken (lookin' at you, Disciple of the Vault + Carnival of Souls), but I still can't help but feel like that is hampering this card a little bit. Maybe if it didn't cost mana for the second ability? I don't know. There's a amazing card in here somewhere, but for now, we'll have to settle for a solid "good" rating.
Pros: Instant-speed creature sack, makes bears
Cons: 2:1 ratio of dead things to bears