Lurrus of the Dream-Den, Flickering Hound, Grimgrin, Corpse-Born, and Crimson Kobolds

Prerequisites

• Lurrus of the Dream-Den on the battlefield
• Flickering Hound on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Crimson Kobolds in hand or in the graveyard

Steps

1. Cast Crimson Kobolds by paying
2. Flickering Hound triggers, blinking Lurrus
3. Resolve the Crimson Kobolds spell
4. Then, activate Grimgrin by sacrificing Crimson Kobolds, putting a +1/+1 counter on Grimgrin and untapping it Repeat

Results

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