Stalwart Successor, Shilgengar, Sire of Famine, and Grazing Kelpie

Prerequisites

• Stalwart Successor on the battlefield
• Shilgengar, Sire of Famine on the battlefield
• Grazing Kelpie on the battlefield

Steps

1. Activate Shilgengar by sacrificing Grazing Kelpie When Grazing Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Grazing Kelpie enters, Stalwart Successor triggers, putting a +1/+1 counter on Grazing Kelpie Resolve the Shilgengar ability
3. Repeat

Results

• Infinite artifact tokens
• Infinite Blood tokens
• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers