Adarkar Valkyrie + Intruder Alarm + Altar of Dementia

Adarkar Valkyrie

Intruder Alarm

Altar of Dementia

How it works

1. Activate Adarkar Valkyrie by tapping it, targeting another nontoken creature you control.
2. Activate Altar of Dementia by sacrificing the creature targeted in step 1.
3. When the creature dies, Adarkar Valkyrie triggers, returning the sacrificed creature from your graveyard to the battlefield.
4. When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
6. Repeat.

This clever loop harnesses **Intruder Alarm** as the ultimate engine, turning every creature arrival into a total tactical reset by untapping all creatures whenever anything enters the battlefield. You use this constant untapping to free up **Adarkar Valkyrie**, whose tap ability sets a delayed safety net to return a doomed creature straight back to your side. By feeding that protected creature to **Altar of Dementia**, you mill your opponent while immediately triggering the Valkyrie's return effect, which in turn trips the Alarm to untap the Valkyrie and start the cycle anew.