Scarecrone, Su-Chi Cave Guard, Voltaic Construct, and Altar of Dementia

Prerequisites

• Scarecrone on the battlefield
• Su-Chi Cave Guard on the battlefield
• Voltaic Construct on the battlefield
• Altar of Dementia on the battlefield
• Scarecrone does not have summoning sickness

Steps

1. Activate Altar of Dementia by sacrificing Su-Chi Cave Guard
2. When Su-Chi Cave Guard dies, it triggers, adding eight
3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Su-Chi Cave Guard's power
4. Activate Scarecrone's second ability by paying and tapping it, returning Su-Chi Cave Guard to the battlefield from your graveyard
5. Activate Voltaic Construct by paying , untapping Scarecrone
6. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Infinite untap of artifact creatures you control