Cauldron of Souls, Dross Scorpion, Arsenal Thresher, and Altar of Dementia

Prerequisites

• Cauldron of Souls on the battlefield
• Dross Scorpion on the battlefield
• Arsenal Thresher on the battlefield
• Altar of Dementia on the battlefield
• You have at least one artifact card in hand
• Arsenal Thresher does not have a -1/-1 counter on it

Steps

1. Activate Cauldron of Souls by tapping it, giving Arsenal Thresher persist until end of turn
2. Activate Altar of Dementia by sacrificing Arsenal Thresher
3. When Arsenal Thresher dies, its persist ability and Dross Scorpion trigger
4. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls
5. Resolve the Arsenal Thresher trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it, and then choosing to reveal at least one artifact card from your hand to remove the -1/-1 counter
6. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Arsenal Thresher's power
7. Repeat

Results

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