Faceless Butcher, Karmic Guide, and Hammerhead, Maggia Boss

Prerequisites

• Faceless Butcher in hand
• Karmic Guide on the battlefield
• Hammerhead, Maggia Boss on the battlefield
• available

Steps

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