Othelm, Sigardian Outcast + Krark-Clan Ironworks + Dross Scorpion + Biotransference

Othelm, Sigardian Outcast
Krark-Clan Ironworks
Dross Scorpion
Biotransference

Requires
All permanents on the battlefield. Othelm does not have summoning sickness.
Steps
  1. Activate Krark-Clan Ironworks by sacrificing Dross Scorpion, adding cc
  2. Dross Scorpion triggers, untapping Othelm
  3. Activate Othelm by paying 2 and tapping it, returning Dross Scorpion from your graveyard to the battlefield
  4. Repeat
Results
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers.