Mortuary + Pitiless Plunderer + Altar of Dementia + Experimental Frenzy

Mortuary

Pitiless Plunderer

Altar of Dementia

Experimental Frenzy

How it works

1. Activate Altar of Dementia 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 Altar of Dementia 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.