Naru Meha, Master Wizard, Fearsome Awakening, and Grimgrin, Corpse-Born

Prerequisites

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

Steps

1. Cast Fearsome Awakening by paying its mana cost
2. Holding priority, cast Naru Meha by paying its mana cost
3. When Naru Meha enters, it triggers, targeting Fearsome Awakening
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 Fearsome Awakening Resolve the Fearsome Awakening 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