Zul Ashur, Lich Lord + Intruder Alarm + Umbral Collar Zealot

Zul Ashur, Lich Lord

Intruder Alarm

Umbral Collar Zealot

How it works

1. Activate Zul Ashur by tapping it, targeting a Zombie card in your graveyard.
2. Activate any number of creatures you control by tapping them, adding enough mana to cast the Zombie.
3. Cast the Zombie from your graveyard by paying its mana cost.
4. When the Zombie enters the battlefield, Intruder Alarm triggers, untapping all creatures.
5. Activate Umbral Collar Zealot by sacrificing the Zombie, putting a +1/+1 counter on Umbral Collar Zealot.
6. Repeat.

This crafty loop turns your graveyard into a revolving door of endless value, anchored by Zul Ashur, Lich Lord tapping to let you recast a Zombie from the bin. Every time that Zombie successfully hits the battlefield, Intruder Alarm triggers to untap all of your creatures, which allows you to tap them for mana or prime them for further action. Meanwhile, Umbral Collar Zealot provides the essential sacrifice outlet to feed the Zombie back to the graveyard and keep the engine running, letting you cycle through your deck with infinite surveil triggers.