Moritte of the Frost, River Kelpie, and Yahenni, Undying Partisan

Prerequisites

• Moritte of the Frost on the battlefield
• River Kelpie on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Moritte of the Frost
2. When Moritte of the Frost dies, its persist ability triggers, returning it from your graveyard to the battlefield as a copy of River Kelpie with one +1/+1 counter on it due to its persist ability and its static effect
3. When Moritte of the Frost enters the battlefield, it and River Kelpie's first ability triggers, causing you to draw two cards
4. Resolve the Yahenni ability from step 1 Repeat

Results

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