Havengul Lich, Grimgrin, Corpse-Born, Earthcraft, and Cathodion

Prerequisites

• Havengul Lich on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Earthcraft on the battlefield
• Cathodion 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 Cathodion, untapping a basic land
5. Activate Grimgrin by sacrificing Cathodion, untapping Grimgrin and putting a +1/+1 counter on it
6. When Cathodion dies, it triggers, adding mana equal to its casting cost
7. Activate Havengul Lich by paying , allowing you to cast Cathodion from your graveyard this turn
8. Cast Cathodion from your graveyard by paying its casting cost
9. Repeat

Results

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