Grimgrin, Corpse-Born, Hero of the Dunes, and Faceless Butcher

Prerequisites

• Grimgrin, Corpse-Born on the battlefield
• Hero of the Dunes on the battlefield
• Faceless Butcher in hand
• available

Steps

1. Cast Faceless Butcher by paying its mana cost
2. When Faceless Butcher enters, its first ability triggers, exiling Hero of the Dunes
3. Activate Grimgrin by sacrificing Faceless Butcher
4. When Faceless Butcher dies, its second ability triggers, returning Hero of the Dunes from exile to the battlefield
5. When Hero of the Dunes enters, it triggers, returning Faceless Butcher from your graveyard to the battlefield
6. When Faceless Butcher enters, its first ability triggers, exiling Hero of the Dunes
7. Resolve the Grimgrin ability
8. 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