Adarkar Valkyrie + Intruder Alarm + Carrion Feeder

Adarkar Valkyrie

Intruder Alarm

Carrion Feeder

How it works

1. Activate Adarkar Valkyrie by tapping it, targeting Carrion Feeder.
2. Activate Carrion Feeder by sacrificing itself.
3. When Carrion Feeder dies, Adarkar Valkyrie triggers, returning Carrion Feeder from your graveyard to the battlefield.
4. When Carrion Feeder enters the battlefield, Intruder Alarm triggers, untapping all creatures.
5. Resolve the Carrion Feeder ability.
6. Repeat.

This elegant loop transforms Adarkar Valkyrie's delayed resurrection trigger into a continuous engine by placing a deferred claim on Carrion Feeder before sending it to the graveyard. The sacrifice itself is fueled by Carrion Feeder's own ability, growing its stats with a +1/+1 counter while satisfying the Valkyrie's condition. As soon as Carrion Feeder returns to the battlefield, Intruder Alarm catches the creature-entry event to untap all creatures, immediately refreshing Adarkar Valkyrie so the cycle can begin anew.