Smile at Death, Lithoform Engine, Corridor Monitor, and Ashnod's Altar

Prerequisites

• Smile at Death on the battlefield
• Lithoform Engine on the battlefield
• Corridor Monitor on the battlefield
• Ashnod's Altar on the battlefield
• undefined

Steps

1. At the beginning of your upkeep, Smile at Death triggers
2. Holding priority, activate Ashnod's Altar by sacrificing Corridor Monitor, adding
3. Activate Lithoform Engine's first ability by paying and tapping it, copying Smile at Death's trigger
4. Resolve the copy of Smile at Death's trigger, returning Corridor Monitor from your graveyard to the battlefield
5. When Corridor Monitor enters the battlefield, it triggers, untapping Lithoform Engine
6. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite graveyard recursion of creatures with power 2 or less