Havengul Lich, Grimgrin, Corpse-Born, Elven Chorus, and Su-Chi

Prerequisites

• Havengul Lich on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Elven Chorus on the battlefield
• Su-Chi on the battlefield

Steps

1. Activate Grimgrin by sacrificing Su-Chi, untapping Grimgrin and putting a +1/+1 counter on it
2. When Su-Chi dies, it triggers, adding mana equal to its casting cost
3. Activate Grimgrin's ability from Elven Chorus by tapping Grimgrin, adding one mana
4. Activate Havengul Lich by paying , allowing you to cast Su-Chi from your graveyard this turn
5. Cast Su-Chi from your graveyard by paying its casting cost
6. 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