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

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite recursion of some creature cards in your graveyard

Smile at Death

Lithoform Engine

Corridor Monitor

Ashnod's Altar

At the beginning of your upkeep, Smile at Death triggers.
Holding priority, activate Krark-Clan Ironworks by sacrificing Corridor Monitor, adding {C}{C}.
Activate Strionic Resonator by paying {2} and tapping it, copying Smile at Death's trigger.
Resolve the copy of Smile at Death's trigger, returning Corridor Monitor from your graveyard to the battlefield.
When Corridor Monitor enters the battlefield, it triggers, untapping Strionic Resonator.
Repeat from step 2.

Strionic Resonator

Krark-Clan Ironworks

At the beginning of your upkeep, Smile at Death triggers.
Holding priority, activate Ashnod's Altar by sacrificing Corridor Monitor, adding {C}{C}.
Activate Strionic Resonator by paying {2} and tapping it, copying Smile at Death's trigger.
Resolve the copy of Smile at Death's trigger, returning Corridor Monitor from your graveyard to the battlefield.
When Corridor Monitor enters the battlefield, it triggers, untapping Strionic Resonator.
Repeat from step 2.

At the beginning of your upkeep, Smile at Death triggers.
Holding priority, activate Krark-Clan Ironworks by sacrificing Corridor Monitor, adding {C}{C}.
Activate Lithoform Engine's first ability by paying {2} and tapping it, copying Smile at Death's trigger.
Resolve the copy of Smile at Death's trigger, returning Corridor Monitor from your graveyard to the battlefield.
When Corridor Monitor enters the battlefield, it triggers, untapping Lithoform Engine.
Repeat from step 2.

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