Thraben Doomsayer, Thornbite Staff, and Ashnod's Altar

Prerequisites

• Thraben Doomsayer on the battlefield
• Thornbite Staff on the battlefield
• Ashnod's Altar on the battlefield
• Thraben Doomsayer does not have summoning sickness
• Thornbite Staff attached to Thraben Doomsayer

Steps

1. Activate Thraben Doomsayer by tapping it, creating a 1/1 Human creature token
2. Activate Ashnod's Altar by sacrificing the Human, adding
3. When the Human dies, Thraben Doomsayer triggers, untapping Thraben Doomsayer
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite damage