This mirror-adjacent matchup against Jund Artifact Sacrifice rewards grinding value, so The Legend of Roku provides card advantage and a late threat that outclasses their artifact-based plan. Ghost Vacuum can exile key graveyard pieces and acts as another sacrifice-fodder artifact for Mayhem Devil while disrupting any Greedy Freebooter or Experimental Synthesizer graveyard shenanigans. Claim the Firstborn is mediocre since most of their creatures (Biotech Specialist, Greedy Freebooter) are low-impact to steal and their deck doesn't mind losing small creatures to sacrifice synergies anyway. Focus on using Mayhem Devil and Deadly Dispute to out-grind their own sacrifice engine while holding up Fatal Push for Oni-Cult Anvil-fueled threats.