Enduring Renewal, Grimgrin, Corpse-Born, and Flamecache Gecko

Prerequisites

• Enduring Renewal on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Flamecache Gecko in hand
• available

Steps

1. Cast Flamecache Gecko by paying its mana cost
2. When Flamecache Gecko enters, it triggers, adding
3. Activate Grimgrin by sacrificing Flamecache Gecko
4. When Flamecache Gecko dies, Enduring Renewal triggers, returning Flamecache Gecko from your graveyard to your hand
5. Resolve the Grimgrin ability, putting a +1/+1 counter on Grimgrin and untapping it
6. 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