Evolution Witness, Ashnod's Altar, and Yuna, Grand Summoner

Prerequisites

• Evolution Witness on the battlefield
• Ashnod's Altar on the battlefield
• Yuna, Grand Summoner on the battlefield

Steps

1. Cast the creature from your hand by paying or less, causing the creature to enter the battlefield with a +1/+1 counter on it
2. Activate Ashnod's Altar by sacrificing the creature, adding
3. When the creature dies, Yuna triggers, putting a +1/+1 counter on Evolution Witness
4. Evolution Witness triggers, returning the creature from your graveyard to your hand
5. Repeat
6. If the creature can be cast for or less, this combo nets infinite colorless mana, and you may cast that creature for an arbitrarily large amount of mana if it has in its mana cost

Results

• Infinite +1/+1 counters on a creature
• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite storm count