Workhorse + Nim Deathmantle + Ashnod's Altar + Impact Tremors

Workhorse
Nim Deathmantle
Ashnod's Altar
Impact Tremors

Requires
Workhorse must be on the battlefield. Nim Deathmantle must be on the battlefield. Ashnod's Altar must be on the battlefield. Impact Tremors must be on the battlefield. Nim Deathmantle attached to Workhorse.
Steps
  1. Activate Workhorse by removing four +1/+1 counters, adding .
  2. Activate Ashnod's Altar by sacrificing Workhorse, adding .
  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 damages to each opponent.
  6. Repeat.
Results
Infinite colorless mana. Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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