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Since you can sacrifice any permanent, it works beyond creature-based sacrifice decks to support sacrificing lands or sacrificing artifacts like Ichor Wellspring

Urza's Iron Alliance is an Esper Artifact Creatures deck that focuses on, well, Artifacts, specifically Artifact Creatures: the deck is loaded up with artifact creatures that fulfill everything the deck needs, from ramp (Etherium Sculptor), to card draw (Thought Monitor), to removal (Noxious Gearhulk), and more

Lots of the best control cards are in white or blue, with black also having control in the form of removal and discard

Three sounded like a good number I thought