Venser, Corpse Puppet + Tainted Observer + Ashnod's Altar
Venser, Corpse Puppet
Tainted Observer
Ashnod's Altar
Requires
Venser, Corpse Puppet must be on the battlefield.
Tainted Observer must be on the battlefield.
Ashnod's Altar must be on the battlefield.
You have a way to cause a creature to enter the battlefield under your control.
Mana needed: 
Steps
- Cause a creature to enter the battlefield under your control.
- Tainted Observer triggers, causing you to pay to proliferate.
- Venser triggers, creating a legendary 3/3 The Hollow Sentinel artifact creature token.
- The Hollow Sentinel enters the battlefield, triggering Tainted Observer.
- Holding priority, activate Ashnod's Altar by sacrifcing The Hollow Sentinel, adding .
- Resolve the Tainted Observer trigger, causing you to pay to proliferate.
- Repeat from step 3.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite proliferate. Infinite sacrifice triggers.
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8% of 50 decks
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Temple of the False God
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Mox Diamond
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Lands
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Exotic Orchard
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Reflecting Pool
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Polluted Delta
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Morphic Pool
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Misty Rainforest
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Evolving Wilds
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Deathcap Glade
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Bountiful Promenade
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Prairie Stream
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Flooded Strand
16% of 50 decks
+5% synergy
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+4% synergy
Llanowar Wastes
16% of 50 decks
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Woodland Cemetery
16% of 50 decks
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Mirrex
14% of 50 decks
+13% synergy
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14% of 50 decks
+4% synergy
Bayou
14% of 50 decks
+0% synergy