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

Color identity: WBG
Mana cost: 
Steps:
  1. Sacrifice Hangarback Walker to Ashnod's Altar, adding {C}{C}.
  2. Hangarback Walker and Colfenor trigger.
  3. Resolve the Hangarback Walker trigger, creating a Thopter token.
  4. Resolve the Colfenor trigger with no targets.
  5. Sacrifice the Thopter token to Ashnod's Altar, adding {C}{C}.
  6. Colfenor triggers, returning Hangarback Walker from your graveyard to your hand.
  7. Cast Hangarback Walker for X=1.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite creature tokens with flying
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count
  - Return any number of creatures from your graveyard to your hand[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Hangarback Walker has at least one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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