Requires

Steps

1. Activate Altar of Dementia by sacrificing Flayer of the Hatebound.
2. Flayer of the Hatebound dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Flayer of the Hatebound enters the battlefield, triggering itself and Intruder Alarm.
4. Resolve the Flayer of the Hatebound trigger, dealing damage equal to its power to any target.
5. Resolve the Intruder Alarm trigger, untapping all creatures.
6. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Flayer of the Hatebound's power.
7. Activate Skeleton Ship by tapping it, putting a -1/-1 counter on Flayer of the Hatebound.
8. Repeat.

Results