How can you create a combo with Sigarda's Summons, Bishop of Wings, Bloodspore Thrinax, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Sigarda's Summons, Bishop of Wings, Bloodspore Thrinax, Phyrexian Altar

Color identity: GW
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing an Angel, adding one mana of any color.
  2. Bishop of Wings triggers, creating a 1/1 Spirit creature token.
  3. The Spirit enters the battlefield with at least one +1/+1 counter and becomes a 4/4 Spirit Angel due to having a +1/+1 counter on it.
  4. Bishop of Wings triggers, causing you to gain four life.
  5. Activate Phyrexian Altar by sacrificing the Spirit token, adding one mana of any color.
  6. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - You control an additional Angel.
  - Bloodspore Thrinax has at least one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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