Spark Double + River Kelpie + Ashnod's Altar

Spark Double
River Kelpie
Ashnod's Altar

Requires
Spark Double must be on the battlefield (as a copy of River Kelpie). River Kelpie 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 River Kelpie with a +1/+1 counter on it.
  4. When Spark Double enters the battlefield, it and River Kelpie's first abilities trigger.
  5. Resolve both triggers, causing you to draw two cards.
  6. Repeat.
Results
Infinite card draw. Infinite draw triggers. Near-infinite colorless mana. Near-infinite death triggers. Near-infinite ETB. Near-infinite LTB. Near-infinite sacrifice triggers.

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