Arahbo, the First Fang, Whitemane Lion, Phyrexian Altar, and Primeval Bounty

Prerequisites

• Arahbo, the First Fang on the battlefield
• Whitemane Lion in hand
• Phyrexian Altar on the battlefield
• Primeval Bounty on the battlefield
• available

Steps

1. Cast Whitemane Lion by paying
2. Primeval Bounty's first ability triggers, creating a 3/3 Beast creature token
3. When Whitemane Lion enters the battlefield, it and Arahbo trigger
4. Resolve the Whitemane Lion trigger, returning it from the battlefield to your hand
5. Resolve the Arahbo trigger, creating a 1/1 Cat creature token
6. Activate Phyrexian Altar twice by sacrificing the Cat and Beast, adding
7. Repeat

Results

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