Evolution Witness + Ashnod's Altar + Host of the Hereafter + Creature with MV<=2 that is colorless and enters the battlefield with a +1/+1 counter on it

Prerequisites

• 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.
• Creature with MV<=2 that is colorless and enters the battlefield with a +1/+1 counter on it

Steps

1. 1Cast the creature from your hand by paying or less, causing the creature to enter the battlefield with a +1/+1 counter on it.
2. 2Activate Ashnod's Altar by sacrificing the creature, adding .
3. 3When the creature dies, Host of the Hereafter triggers, putting a +1/+1 counter on Evolution Witness.
4. 4Evolution Witness triggers, returning the creature from your graveyard to your hand.
5. 5Repeat.
6. 6If 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.

Effects

• 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