Cauldron of Souls + Dross Scorpion + Blasting Station + Mycosynth Lattice

Cauldron of Souls

Dross Scorpion

Blasting Station

Mycosynth Lattice

How it works

1. Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
2. Activate Blasting Station by tapping it and sacrificing the creature with bloodthirst.
3. When the creature dies, its persist ability and Dross Scorpion trigger.
4. Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
5. When the creature enters the battlefield, Blasting Station triggers, untapping Blasting Station.
6. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
7. Resolve the Blasting Station ability from step 2, dealing 1 damage to any target.
8. Repeat.