Havengul Lich + Grimgrin, Corpse-Born + Impulsive Pilferer + Elven Chorus

Havengul Lich

Grimgrin, Corpse-Born

Impulsive Pilferer

Elven Chorus

How it works

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