Jan Jansen, Chaos Crafter, Pitiless Plunderer, Ashnod's Altar, and Umbral Mantle

Prerequisites

• Jan Jansen, Chaos Crafter on the battlefield
• Pitiless Plunderer on the battlefield
• Ashnod's Altar on the battlefield
• Umbral Mantle on the battlefield
• Umbral Mantle attached to Jan Jansen
• You control at least one additional noncreature artifact

Steps

1. Activate Jan Jansen's second ability by tapping it and sacrificing any other noncreature artifact, creating two 1/1 Construct creature tokens
2. Activate Ashnod's Altar twice by sacrificing both Construct tokens, adding
3. The Constructs die, triggering Pitiless Plunderer twice, creating two Treasure tokens
4. Activate Jan Jansen by paying and untapping it, giving itself +2/+2 until end of turn
5. Repeat

Results

• Infinite colored mana
• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinitely large Jan Jansen until end of turn
• Infinite sacrifice triggers
• Infinite Treasure tokens