Activate Helvault by paying {1} and tapping it, exiling Kami of Industry.
Activate Krark-Clan Ironworks by sacrificing Helvault, adding {C}{C}.
Helvault leaves the battlefield, returning Kami of Industry from exile to the battlefield.
Kami of Industry enters the battlefield, returning Helvault from your graveyard to the battlefield.
Repeat.

Infinite colorless mana

Infinite ETB

Infinite LTB

Kami of Industry

Helvault

Krark-Clan Ironworks

Cast Cursed Mirror by paying {2}{R}, having it enter the battlefield as a copy of Kami of Industry with haste.
Put Cursed Mirror into your graveyard due to the legend rule.
Cursed Mirror's enters the battlefield ability triggers, returning itself from your graveyard to the battlefield as a copy of Kami of Industry with haste.
Repeat from step 2.

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