Havengul Lich, Grimgrin, Corpse-Born, and Earthcraft

Prerequisites

• Havengul Lich on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Earthcraft on the battlefield

Steps

1. Activate a basic land by tapping it, adding one mana
2. Activate Earthcraft by tapping Grimgrin, untapping a basic land
3. Activate a basic land by tapping it, adding one mana
4. Activate Earthcraft by tapping the cheap creature, untapping a basic land
5. Activate Grimgrin by sacrificing the cheap creature, untapping Grimgrin and putting a +1/+1 counter on it
6. Activate Havengul Lich by paying , allowing you to cast the sacrificed creature from your graveyard this turn
7. Cast that creature from your graveyard by paying its mana cost
8. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mana basic lands you control can produce
• Infinite storm count
• Infinite untap of basic lands you control