Pride Sovereign, Phyrexian Altar, and Intruder Alarm

Prerequisites

• Pride Sovereign on the battlefield
• Phyrexian Altar on the battlefield
• Intruder Alarm on the battlefield
• Pride Sovereign does not have summoning sickness
• available

Steps

1. Activate Pride Sovereign by paying , tapping and exerting Pride Sovereign, creating two 1/1 Cat creature tokens
2. The Cat tokens enter the battlefield, triggering Intruder Alarm twice, untapping all creatures
3. Activate Phyrexian Altar by sacrificing a Cat token, adding
4. Repeat

Results

• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of all creatures