Jan Jansen, Chaos Crafter + Pitiless Plunderer + Sword of the Paruns + Krark-Clan Ironworks
Jan Jansen, Chaos Crafter
Pitiless Plunderer
Sword of the Paruns
Krark-Clan Ironworks
Infinite colorless manaInfinite creature tokensInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite untap of creatures you controlInfinite mana creatures you control can produce
How it works
Activate Jan Jansen's second ability by tapping it and sacrificing any other noncreature artifact, creating two 1/1 Construct creature tokens.
Activate Krark-Clan Ironworks twice by sacrificing both Construct tokens, adding CCCC.
When the Constructs die, Pitiless Plunderer triggers twice, creating two Treasure tokens.
Activate Sword of the Paruns by paying 3, untapping Jan Jansen.