Cayth, Famed Mechanist, Aethergeode Miner, and Guide of Souls

Prerequisites

• Cayth, Famed Mechanist on the battlefield
• Aethergeode Miner on the battlefield
• Guide of Souls on the battlefield

Steps

1. Activate Aethergeode Miner by paying , blinking it
2. When Aethergeode Miner enters the battlefield, its fabricate ability and Guie of Souls trigger
3. Resolve the Guide of Souls trigger, causing you to get and gain 1 life
4. Resolve the Aethergeode Miner trigger, creating a 1/1 Servo artifact creature token
5. When the Servo enters the battlefield, Guide of Souls triggers, causing you to get and gain 1 life
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite lifegain triggers
• Infinite lifegain
• Infinite creature tokens