Shilgengar, Sire of Famine, and Builder's Talent

Prerequisites

• Shilgengar, Sire of Famine on the battlefield
• Builder's Talent on the battlefield

Steps

1. Activate Shilgengar's first ability by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Resolve the Shilgengar ability, creating a Blood token
4. When the Blood token enters the battlefield, Builder's Talent's second ability triggers, putting a +1/+1 counter on the persist creature
5. Repeat

Results

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