Cayth, Famed Mechanist, Thornbite Staff, and Ashnod's Altar

Prerequisites

• Cayth, Famed Mechanist on the battlefield
• Thornbite Staff on the battlefield
• Ashnod's Altar on the battlefield
• Thornbite Staff attached to Cayth
• Cayth does not have summoning sickness
• You control at least one creature token
• available

Steps

1. Activate Cayth by paying and tapping it, creating a copy of a creature token you control
2. Activate Ashnod's Altar by sacrificing the creature token, adding
3. When the creature dies, Cayth triggers, untapping Cayth
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers