Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Shilgengar, Sire of Famine, and Hancock, Ghoulish Mayor

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Shilgengar, Sire of Famine on the battlefield
• Hancock, Ghoulish Mayor on the battlefield

Steps

1. Activate Shilgengar by sacrificing Hancock When Hancock dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
2. Resolve the Shilgengar ability
3. Activate Shilgengar by sacrificing Hancock When Hancock dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. Hancock enters and dies as a state-based action due to having 0 toughness
5. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
6. Resolve the Shilgengar ability from step 4
7. Repeat from step 4

Results

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