Havengul Lich + Grimgrin, Corpse-Born + Paradise Mantle + Selvala, Eager Trailblazer

Havengul Lich

Grimgrin, Corpse-Born

Paradise Mantle

Selvala, Eager Trailblazer

How it works

1. Activate Grimgrin's ability from Paradise Mantle by tapping Grimgrin, adding one mana.
2. Activate Grimgrin by sacrificing the creature castable for one mana, untapping Grimgrin and putting a +1/+1 counter on it.
3. Activate Grimgrin's ability from Paradise Mantle by tapping Grimgrin, adding one mana.
4. Activate Havengul Lich by paying 1, allowing you to cast the creature castable for one mana from your graveyard this turn.
5. Cast that creature spell from your graveyard by paying it mana cost.
6. When you cast that creature or when it enters, Selvala triggers, creating a creature token.
7. Activate Grimgrin by sacrificing the creature token, untapping Grimgrin and putting a +1/+1 counter on it.
8. Repeat.