Spark Double + Murderous Redcap + Ashnod's Altar

Spark Double
Murderous Redcap
Ashnod's Altar

Requires
Spark Double must be on the battlefield (as a copy of Murderous Redcap). Murderous Redcap must be on the battlefield. Ashnod's Altar must be on the battlefield.
Steps
  1. Activate Ashnod's Altar by sacrificing Spark Double, adding .
  2. When Spark Double dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  3. As Spark Double enters the battlefield, choose to have it enter the battlefield as a copy of Murderous Redcap with a +1/+1 counter on it.
  4. When Spark Double enters the battlefield, it triggers, dealing damage equal to its power to any target.
  5. Repeat.
Results
Infinite colorless mana. Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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