Moritte of the Frost, River Kelpie, and Phyrexian Altar

Prerequisites

• Moritte of the Frost on the battlefield
• River Kelpie on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Moritte of the Frost, adding one mana of any color
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 two +1/+1 counters on it and one -1/-1 counter on it
3. Remove one +1/+1 counter and one -1/-1 counter from Moritte of the Frost as a state-based action
4. When Moritte of the Frost enters the battlefield, it and River Kelpie's first ability triggers, causing you to draw two cards
5. Repeat

Results

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