Aragorn, the Uniter, Whitemane Lion, Phyrexian Altar, and Doubling Season

Prerequisites

• Aragorn, the Uniter on the battlefield
• Whitemane Lion in hand
• Phyrexian Altar on the battlefield
• Doubling Season on the battlefield
• available

Steps

1. Cast Whitemane Lion by paying
2. Aragorn's first ability triggers, creating two 1/1 Human Soldier creature tokens
3. When Whitemane Lion enters the battlefield, it triggers, returning itself from the battlefield to your hand
4. Activate Phyrexian Altar twice by sacrificing the Human Soldiers, adding
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count