Killian, Ink Duelist, Enduring Renewal, Phyrexian Altar, and Cubwarden

Prerequisites

• Killian, Ink Duelist on the battlefield
• Enduring Renewal on the battlefield
• Phyrexian Altar on the battlefield
• Cubwarden in hand
• You control a non-Human creature
• available

Steps

1. Cast Cubwarden for its mutate cost by paying , targeting a non-Human creature you control
2. The Cubwarden mutated creature triggers, creating two 1/1 Cat creature tokens
3. Activate Phyrexian Altar by sacrificing the Cubwarden mutated creature, adding
4. When the Cubwarden mutated creature dies, Enduring Renewal triggers, returning Cubwarden and any cards merged with it from your graveyard to your hand
5. Activate Phyrexian Altar by sacrificing a Cat token, adding
6. Repeat

Results

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