Cauldron of Souls, Dross Scorpion, Sarcatog, and Mycosynth Lattice

Prerequisites

• Cauldron of Souls on the battlefield
• Dross Scorpion on the battlefield
• Sarcatog on the battlefield
• Mycosynth Lattice 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 Sarcatog's second ability 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 Sarcatog ability, giving it +1/+1 until end of turn
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinitely large Sarcatog until end of turn