Infinite death triggersInfinite creature ETBInfinite creature LTBInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures
How it works
Activate Ashnod's Altar by sacrificing any other nontoken creature, adding CC.
Activate Othelm by paying 2 and tapping it, returning a creature from your graveyard to the battlefield.
The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures.