Grimgrin, Corpse-Born, Sun Titan, and Faceless Butcher

Prerequisites

• Grimgrin, Corpse-Born on the battlefield
• Sun Titan 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 Sun Titan
3. Activate Grimgrin by sacrificing Faceless Butcher
4. When Faceless Butcher dies, its second ability triggers, returning Sun Titan from exile to the battlefield
5. When Sun Titan enters, it triggers, returning Faceless Butcher from your graveyard to the battlefield
6. When Faceless Butcher enters, its first ability triggers, exiling Sun Titan
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