Dualcaster Mage, Faith's Reward, and Altar of Dementia

Prerequisites

• Dualcaster Mage in hand
• Faith's Reward in hand
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Faith's Reward by paying
2. Holding priority, cast Dualcaster Mage by paying
3. Dualcaster Mage enters the battlefield, copying Faith's Reward
4. Holding priority, activate Altar of Dementia by sacrificing Dualcaster Mage, causing target player to mill cards equal to Dualcaster Mage's power
5. Resolve the Faith's Reward copy, returning permanents that was put in your graveyard this turn to the battlefield
6. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers