Ashnod's Altar, Thran Vigil, and Rendclaw Trow

Prerequisites

• Ashnod's Altar on the battlefield
• Thran Vigil on the battlefield
• Rendclaw Trow on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Rendclaw Trow
2. When Rendclaw Trow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil triggers, putting a +1/+1 counter on Rendclaw Trow
4. Repeat

Results

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