Scarecrone + Thornbite Staff + Su-Chi + Phyrexian Altar

Scarecrone
Thornbite Staff
Su-Chi
Phyrexian Altar

Requires
Scarecrone must be on the battlefield. Thornbite Staff must be on the battlefield. Su-Chi must be on the battlefield. Phyrexian Altar must be on the battlefield. Thornbite Staff attached to Scarecrone. Scarecrone does not have summoning sickness.
Steps
  1. Activate Phyrexian Altar by sacrificing Su-Chi, adding one mana of any color.
  2. Su-Chi dies, triggering itself and Scarecrone.
  3. Resolve the Su-Chi trigger, adding .
  4. Resolve the Scarecrone trigger, untapping it.
  5. Activate Scarecrone's second ability by paying 4 and tapping it, returning Su-Chi from your graveyard to the battlefield.
  6. Repeat.
Results
Infinite colored mana. Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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Creatures
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Psychosis Crawler
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Soulless Jailer
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Voltaic Construct
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Lodestone Golem
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Kozilek, Butcher of Truth
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Instants
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Scour from Existence
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Utility Artifacts
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Storage Matrix
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Static Orb
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Winter Orb
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Altar of Dementia
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