Cauldron of Souls, Dross Scorpion, Bloodflow Connoisseur, and Encroaching Mycosynth

Prerequisites

• Cauldron of Souls on the battlefield
• Dross Scorpion on the battlefield
• Bloodflow Connoisseur on the battlefield
• Encroaching Mycosynth on the battlefield
• An opponent was dealt damage this turn
• The creature with bloodthirst does not have a -1/-1 counter on it

Steps

1. Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn
2. Activate Bloodflow Connoisseur by 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. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls
6. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Bloodflow Connoisseur