Altar of Dementia, and Combine Guildmage

Prerequisites

• Altar of Dementia on the battlefield
• Combine Guildmage on the battlefield
• available

Steps

1. Activate Combine Guildmage's first ability by paying and tapping it
2. Activate Altar of Dementia by sacrificing the persist creature
3. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Combine Guildmage
4. Resolve the Altar of Dementia ability
5. Repeat from step 2

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite mill
• Infinite creature sacrifice triggers
• Infinite self-mill