Reyhan, Last of the Abzan, Evolution Witness, and Ashnod's Altar

Prerequisites

• Reyhan, Last of the Abzan on the battlefield
• Evolution Witness on the battlefield
• Ashnod's Altar on the battlefield
• You have enough mana to cast the creature with MV<=2 if it doesn't have in its mana cost, or enough to cast it with X=1 otherwise

Steps

1. Cast the creature with MV<=2 by paying its mana cost if it doesn't have in its mana cost, or by paying enough mana where X=1 otherwise, 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, Reyhan 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 Evolution Witness
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count