Fain, the Broker, Thornbite Staff, Arcane Adaptation, and Bishop of Wings

Prerequisites

• Fain, the Broker on the battlefield
• Thornbite Staff on the battlefield
• Arcane Adaptation on the battlefield
• Bishop of Wings on the battlefield
• You control at least one additional creature
• Thornbite Staff attached to Fain
• Fain does not have summoning sickness
• "Angel" chosen with Arcane Adaptation

Steps

1. Activate Fain's first ability by tapping it and sacrificing a creature
2. When the creature dies, Bishop of Wings' second ability and Fain trigger
3. Resolve the Bishop of Wings trigger, creating a 1/1 Spirit creature token
4. When the Spirit enters the battlefield, Bishop of Wings' first ability triggers, causing you to gain 4 life
5. Resolve the Fain trigger, untapping it
6. Resolve the Fain ability from step 1, putting two +1/+1 counters on a creature you control
7. Repeat

Results

• Infinite +1/+1 counters
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite LTB
• Infinite sacrifice triggers