Skeleton Ship + Intruder Alarm + Flayer of the Hatebound + Altar of Dementia

Skeleton Ship

Intruder Alarm

Flayer of the Hatebound

Altar of Dementia

How it works

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.

This clever loop turns Skeleton Ship into an unlikely counter-distributor, using its ability to place a -1/-1 counter on Flayer of the Hatebound to constantly offset the +1/+1 counter granted by its undying ability. Each time Flayer of the Hatebound returns to the battlefield, Intruder Alarm triggers to untap your board, letting you tap Skeleton Ship repeatedly while Altar of Dementia sacrifices the Flayer to mill an opponent. Meanwhile, Flayer of the Hatebound's own entry trigger capitalizes on the graveyard recursion to blast any target for lethal damage over and over again.