Phyrexian Altar, Graceful Reprieve, and Naru Meha, Master Wizard

Prerequisites

• Phyrexian Altar on the battlefield
• Graceful Reprieve in hand
• Naru Meha, Master Wizard in hand
• available

Steps

1. Cast Graceful Reprieve by paying its mana cost
2. Holding priority, cast Naru Meha by paying its mana cost
3. When Naru Meha enters, it triggers, copying Graceful Reprieve, with the copy targeting Naru Meha
4. Resolve the copy of Graceful Reprieve
5. Holding priority, activate Phyrexian Altar by sacrificing Naru Meha
6. When Naru Meha dies, Graceful Reprieve triggers, returning Naru Meha from your graveyard to the battlefield
7. Repeat from step 3

Results

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