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

Color identity: GW
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing an Angel.
  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. Resolve Altar of Dementia's ability, causing target player to mill a number of cards equal to the sacrificed Angel's power.
  6. Activate Altar of Dementia by sacrificing the Spirit token.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[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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