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

Prerequisites

• You control an additional Angel.

Steps

1. 1Activate Phyrexian Altar by sacrificing an Angel, adding one mana of any color.
2. 2Bishop of Wings triggers, creating a 1/1 Spirit creature token.
3. 3The Spirit enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
4. 4The Spirit token becomes a 4/4 Spirit Angel due to having a +1/+1 counter on it.
5. 5Activate Phyrexian Altar by sacrificing the Spirit token, adding one mana of any color.
6. 6Repeat from step 2.

Effects

• Infinite +1/+1 counters on creatures you control
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers