Phyrexian Altar, Restless Apparition, and Thran Vigil

Prerequisites

• Phyrexian Altar on the battlefield
• Restless Apparition on the battlefield
• Thran Vigil on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Restless Apparition
2. When Restless Apparition 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 Restless Apparition
4. Repeat

Results

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