Smile at Death + Lithoform Engine + Corridor Monitor + Ashnod's Altar

Prerequisites

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Steps

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

Effects

• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite recursion of some creature cards in your graveyard