Stalwart Successor, and Phyrexian Altar

Prerequisites

• Stalwart Successor on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning the persist creature from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters, Stalwart Successor triggers, putting a +1/+1 counter on the persist creature
4. Repeat

Results

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