Phyrexian Altar, Chthonian Nightmare, and Weaponcraft Enthusiast

Prerequisites

• Phyrexian Altar on the battlefield
• Chthonian Nightmare in hand
• Weaponcraft Enthusiast on the battlefield
• available

Steps

1. Cast Chthonian Nightmare by paying
2. When Chthonian Nightmare enters, it triggers, causing you to get
3. Activate Chthonian Nightmare by paying , sacrificing a creature and returning Chthonian Nightmare from the battlefield to your hand, returning Weaponcraft Enthusiast from your graveyard to your hand
4. When Weaponcraft Enthusiast enters, it triggers, creating two 1/1 Servo artifact creature tokens
5. Activate Phyrexian Altar twice by sacrificing Weaponcraft Enthusiast and a Servo, adding
6. Repeat

Results

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