Adarkar Valkyrie + Intruder Alarm + Blasting Station

Adarkar Valkyrie

Intruder Alarm

Blasting Station

How it works

1. Activate Adarkar Valkyrie by tapping it, targeting another nontoken creature you control.
2. Activate Blasting Station by tapping it and 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 and Blasting Station trigger.
5. Resolve the Intruder Alarm trigger, untapping all creatures.
6. Resolve the Blasting Station trigger, untapping it.
7. Resolve the Blasting Station ability from step 2, dealing 1 damage to any target.
8. Repeat.

This clever loop centers around Adarkar Valkyrie's ability to mark a creature for resurrection, which feeds directly into the sacrifice outlet provided by Blasting Station. Every time that creature is sacrificed to deal damage, Adarkar Valkyrie's delayed trigger returns it straight to the battlefield. That reentry is where Intruder Alarm and Blasting Station's own passive triggers shine: Intruder Alarm untaps all your creatures—including the Valkyrie—while Blasting Station simultaneously untaps itself, priming the whole apparatus to fire again and again until your opponents are reduced to ash.