Denry Klin, Editor in Chief, River Kelpie, and Ashnod's Altar

Prerequisites

• Denry Klin, Editor in Chief on the battlefield
• River Kelpie on the battlefield
• Ashnod's Altar on the battlefield
• Denry Klin has at least one +1/+1 counter on it
• River Kelpie does not have a -1/-1 counter on it

Steps

1. Activate Ashnod's Altar by sacrificing River Kelpie, adding
2. River Kelpie dies, triggering its persist ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. River Kelpie enters the battlefield, triggering itself and Denry Klin
4. Resolve the River Kelpie trigger, causing you to draw a card
5. Resolve the Denry Klin trigger, putting a +1/+1 counter on River Kelpie
6. Repeat

Results

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