Phyrexian Altar, and Good-Fortune Unicorn

Prerequisites

• Phyrexian Altar on the battlefield
• Good-Fortune Unicorn on the battlefield

Steps

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

Results

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