How can you create a combo with Siona, Captain of the Pyleas, Reins of the Vinesteed, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Siona, Captain of the Pyleas, Reins of the Vinesteed, Phyrexian Altar

Color identity: GW
Mana cost: {3}{G}
Steps:
  1. Cast Reins of the Vinesteed by paying {3}{G}, enchanting any Human or Soldier you control besides Siona.
  2. Siona triggers, creating a 1/1 Human Soldier creature token.
  3. Activate Phyrexian Altar by sacrificing the creature enchanted by Reins of the Vinesteed, adding one mana of any color.
  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.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Siona, Captain of the Pyleas must be on the battlefield
  - Reins of the Vinesteed must be in your hand
  - Phyrexian Altar must be on the battlefield
  - You control another Human or Solider.
[END OF COMBO PREREQUISITES]
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