Sigarda's Summons + Bishop of Wings + Cathars' Crusade + Ashnod's Altar

Sigarda's Summons
Bishop of Wings
Cathars' Crusade
Ashnod's Altar

Requires
Sigarda's Summons must be on the battlefield. Bishop of Wings must be on the battlefield. Cathars' Crusade must be on the battlefield. Ashnod's Altar must be on the battlefield. You control an additional Angel.
Steps
  1. Activate Ashnod's Altar by sacrificing an Angel, adding .
  2. Bishop of Wings triggers, creating a 1/1 Spirit creature token.
  3. The Spirit enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
  4. The Spirit token becomes a 4/4 Spirit Angel due to having a +1/+1 counter on it.
  5. Activate Ashnod's Altar by sacrificing the Spirit token, adding .
  6. Repeat from step 2.
Results
Infinite +1/+1 counters. Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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