Shilgengar, Sire of Famine, River Kelpie, and Hardened Academic

Prerequisites

• Shilgengar, Sire of Famine on the battlefield
• River Kelpie on the battlefield
• Hardened Academic on the battlefield

Steps

1. Activate Shilgengar by sacrificing River Kelpie
2. When River Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Hardened Academic and River Kelpie trigger
4. Resolve the Hardened Academic trigger, putting a +1/+1 counter on River Kelpie
5. Resolve the River Kelpie trigger, causing you to draw a card
6. Resolve the Shilgengar ability Repeat

Results

• Infinite Blood tokens
• Infinite card draw
• Infinite draw triggers
• Near-infinite Blood tokens
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers