Skeleton Ship + Intruder Alarm + Flayer of the Hatebound + Viscera Seer
Skeleton Ship
Intruder Alarm
Flayer of the Hatebound
Viscera Seer
Infinite damageInfinite death triggersInfinite creature ETBInfinite lifelossInfinite creature LTBInfinite mana creatures you control can produceInfinite creature sacrifice triggersInfinite untap of creatures
How it works
Activate Viscera Seer by sacrificing Flayer of the Hatebound.
Flayer of the Hatebound dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Flayer of the Hatebound enters the battlefield, triggering itself and Intruder Alarm.
Resolve the Flayer of the Hatebound trigger, dealing damage equal to its power to any target.
Resolve the Intruder Alarm trigger, untapping all creatures.
Resolve the Viscera Seer ability from step 1, causing you to scry 1.
Activate Skeleton Ship by tapping it, putting a -1/-1 counter on Flayer of the Hatebound.