Mortuary + Pitiless Plunderer + Grimgrin, Corpse-Born + Future Sight

Mortuary

Pitiless Plunderer

Grimgrin, Corpse-Born

Future Sight

How it works

1. Activate Grimgrin by sacrificing the nontoken creature.
2. When the creature dies, Mortuary and Pitiless Plunderer trigger.
3. Resolve the Mortuary trigger, putting the creature from your graveyard onto the top of your library.
4. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
5. Resolve the Grimgrin ability.
6. Activate the Treasure by tapping and sacrificing it, adding one mana of any color.
7. Cast the creature from the top of your library by paying its mana cost
8. Repeat.

This fascinating loop harnesses Grimgrin, Corpse-Born as a deadly sacrifice outlet that continually untaps itself while growing ever larger. Pitiless Plunderer fuels this engine by turning every creature's demise into a fresh Treasure token, providing the mana needed to keep the cycle turning. Meanwhile, Mortuary ensures your sacrificed creature never truly stays in the graveyard, neatly placing it back on top of your library where Future Sight lets you cast it over and over again.