Evolution Witness + Iron Apprentice + Ashnod's Altar
Evolution Witness
Iron Apprentice
Ashnod's Altar
Requires
Evolution Witness must be on the battlefield.
Iron Apprentice must be in hand.
Ashnod's Altar must be on the battlefield.
Mana needed: 
Steps
- Cast Iron Apprentice by paying , causing it to enter the battlefield with a +1/+1 counter on it.
- Activate Ashnod's Altar by sacrificing Iron Apprentice, adding .
- When Iron Apprentice dies, it triggers, putting a +1/+1 counter on Evolution Witness.
- Evolution Witness triggers, returning Iron Apprentice from your graveyard to your hand.
- Repeat.
Results
Infinite +1/+1 counters on Evolution Witness. Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite storm count.
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