River Kelpie, Bloodflow Connoisseur, and Hardened Academic

Prerequisites

• River Kelpie on the battlefield
• Bloodflow Connoisseur on the battlefield
• Hardened Academic on the battlefield

Steps

1. Activate Bloodflow Connoisseur 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 Bloodflow Connoisseur ability Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite +1/+1 counters on a creature
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers