How can you create a combo with Colfenor, the Last Yew, Ashnod's Altar, Shifting Wall, Stonecoil Serpent?
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[START OF COMBO]This combo can be formed with Colfenor, the Last Yew, Ashnod's Altar, Shifting Wall, Stonecoil Serpent

Color identity: WBG
Mana cost: 
Steps:
  1. Sacrifice Shifting Wall to Ashnod's Altar for {C}{C}.
  2. Colfenor triggers, returning Stonecoil Serpent from your graveyard to your hand.
  3. Cast Stonecoil Serpent for {1}.
  4. Sacrifice Stonecoil Serpent to Ashnod's Altar for {C}{C}.
  5. Colfenor triggers, returning Shifting Wall from your graveyard to your hand.
  6. Cast Shifting Wall for {1}.
  7. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Colfenor, the Last Yew must be on the battlefield
  - Ashnod's Altar must be on the battlefield
  - Shifting Wall must be on the battlefield
  - Stonecoil Serpent must be in the graveyard
  - At least one +1/+1 counter on Shifting Wall.
[END OF COMBO PREREQUISITES]
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