Workhorse + Nim Deathmantle + Impact Tremors + Phyrexian Altar

Workhorse
Nim Deathmantle
Impact Tremors
Phyrexian Altar

Requires
Workhorse must be on the battlefield. Nim Deathmantle must be on the battlefield. Impact Tremors must be on the battlefield. Phyrexian Altar must be on the battlefield. Nim Deathmantle attached to Workhorse.
Steps
  1. Activate Workhorse by removing four +1/+1 counters, adding .
  2. Activate Phyrexian Altar by sacrificing Workhorse, adding one mana of any color.
  3. Workhorse dies, triggering Nim Deathmantle, causing you to pay 4 to return Workhorse from your graveyard to the battlefield, and attach Nim Deathmantle to it.
  4. Workhorse enters the battlefield with four +1/+1 counters on it.
  5. Impact Tremors triggers, dealing 1 damage to each opponent.
  6. Repeat.
Results
Infinite colored mana. Infinite colorless mana. Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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