River Kelpie, Solemnity, and Phyrexian Altar

Prerequisites

• River Kelpie on the battlefield
• Solemnity on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing River Kelpie, adding
2. River Kelpie's persist triggers, returning it from your graveyard to the battlefield
3. River Kelpie enters the battlefield, causing you to draw
4. Repeat

Results

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