Naru Meha, Master Wizard, What Must Be Done, and Yahenni, Undying Partisan

Prerequisites

• Naru Meha, Master Wizard in hand
• What Must Be Done in hand
• Yahenni, Undying Partisan on the battlefield
• You have at least one historic permanent card in your graveyard
• available

Steps

1. Cast What Must Be Done by paying , targeting any historic permanent card in your graveyard
2. Holding priority, cast Naru Meha by paying
3. When Naru Meha enters the battlefield, it triggers, targeting What Must Be Done
4. Holding priority, activate Yahenni by sacrificing Naru Meha
5. Resolve the Naru Meha trigger, copying What Must Be Done, targeting Naru Meha
6. Resolve the copy of What Must Be Done, returning Naru Meha from your graveyard to the battlefield with two +1/+1 counters on it
7. Repeat from step 3

Results

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