Naru Meha, Master Wizard, Grimgrin, Corpse-Born, and Rise Again

Prerequisites

• Naru Meha, Master Wizard in hand
• Grimgrin, Corpse-Born on the battlefield
• Rise Again in hand
• available

Steps

1. Cast Rise Again by paying its mana cost
2. Holding priority, cast Naru Meha by paying its mana cost
3. When Naru Meha enters, it triggers, targeting Rise Again
4. Holding priority, activate Grimgrin by sacrificing Naru Meha, putting a +1/+1 counter on Grimgrin and untapping it
5. Resolve the Naru Meha trigger, copying Rise Again Resolve the Rise Again copy, returning Naru Meha from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers