Justification:
Simple replacement of a couple cards here. The Aristocrats archetype has enough free sacrifice effects that Hobblefiend and Legion Vanguard don't advance the strategy much, while Scrapwork Mutt and Ashnod's Harvester fit in not only as sacrifice fodder but as recursive aggro creatures and fuel for Delirium thanks to the Artifact + Creature typing.

Future Considerations:
Combat Courier, just haven't yet decided what to swap out.