The one thing really preventing this card from being insane is simply the fact that most decks running a ton of low-cost artifacts dont really want a random seven-drop dino, but in PauperEDH, we can build the perfect deck for the card and really take advantage of its power
These are the free sacrifice outlets in this deck: Altar of Dementia Carrion Feeder Cartel Aristocrat Spawning Pit Viscera Seer Priest of Forgotten Gods (must tap Priest of Forgotten Gods but should probably be done at sorcery speed unless you have an instant to use with the 2 extra black mana the ability will give you) While these are probably your best targets to sacrifice a creature, there are a couple more
Use a card price tracking tool to ensure youre getting a fair deal
This can be either through silver bordered cards that simply make the whole ordeal an absurd joke or by working around the limits of black bordered cards in original and imaginative ways
Ultima, Origin of Oblivion is a five-cost colorless card with four power and defense
Ragavan, Nimble Pilferer [c]Ragavan[/c] is one of the most powerful one-cost creatures in MTG