Saffi Eriksdotter, Shepherd of the Cosmos, and Grimgrin, Corpse-Born

Prerequisites

• Saffi Eriksdotter on the battlefield
• Shepherd of the Cosmos on the battlefield
• Grimgrin, Corpse-Born on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Shepherd of the Cosmos Activate Grimgrin by sacrificing Shepherd of the Cosmos When Shepherd of the Cosmos dies, Saffi triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield
2. When Shepherd of the Cosmos enters, it triggers, returning Saffi from your graveyard to the battlefield
3. Resolve the Grimgrin ability
4. Repeat

Results

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