Biotransference + Cauldron of Souls + Dross Scorpion + Krark-Clan Ironworks

B identity

Commander legal

The 4 combo pieces

What must be in place

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

How to execute it

  1. Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
  2. Activate Krark-Clan Ironworks by sacrificing the creature with bloodthirst, adding {C}{C}.
  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. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
  6. Repeat.

What the combo produces