Spark Double + Lesser Masticore + Ashnod's Altar

Spark Double
Lesser Masticore
Ashnod's Altar

Requires
Spark Double must be on the battlefield (as a copy of Lesser Manticore). Lesser Masticore 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 Lesser Masticore with a +1/+1 counter on it.
  4. Repeat.
Results
Infinite colorless mana. Infinite damage to creatures. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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