Siona, Captain of the Pyleas, Reins of the Vinesteed, and Ashnod's Altar

Prerequisites

• Siona, Captain of the Pyleas on the battlefield
• Reins of the Vinesteed in hand
• Ashnod's Altar on the battlefield
• available

Steps

1. Cast Reins of the Vinesteed by paying , enchanting any Human or Soldier you control besides Siona
2. Siona triggers, creating a 1/1 Human Soldier creature token
3. Activate Ashnod's Altar by sacrificing the creature enchanted by Reins of the Vinesteed, adding
4. The creature dies, triggering Reins of the Vinesteed, returning Reins of the Vinesteed to the battlefield enchanting the Human Soldier token
5. Siona triggers, creating a 1/1 Human Soldier creature token
6. Repeat from step 3

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers