Colfenor, the Last Yew, Gutter Grime, and Altar of Dementia

Prerequisites

• Colfenor, the Last Yew on the battlefield
• Gutter Grime on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Cast the creature card in your hand by paying
2. Either that creature dies as a state-based action due to having zero toughness, or activate Altar of Dementia by sacrificing that creature
3. Gutter Grime triggers, putting a slime counter on it and creating a X/X Ooze creature token
4. Activate Altar of Dementia by sacrificing the Ooze
5. When the Ooze dies, Colfenor triggers, returning the creature card from your graveyard to your hand
6. If the Altar of Dementia abilities, milling target player a number of cards equal to the sacrificed creature's power each time
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill
• Infinite storm count
• Infinite creature tokens that are infinitely large