Ulamog's Dreadsire + Thornbite Staff + Umbral Collar Zealot

Ulamog's Dreadsire

Thornbite Staff

Umbral Collar Zealot

How it works

1. Activate Ulamog's Dreadsire by tapping it, creating a 10/10 Eldrazi creature tokens.
2. Activate Umbral Collar Zealot by sacrificing the Eldrazi token.
3. When the Eldrazi token dies, Ulamog's Dreadsire triggers, untapping Ulamog's Dreadsire.
4. Resolve the Umbral Collar Zealot ability
5. Repeat.

This looping engine turns Ulamog's Dreadsire into a relentless token factory by outfitting it with Thornbite Staff, granting it the ability to ping targets and automatically untap whenever anything dies. By tapping the Dreadsire to create a massive 10/10 Eldrazi token and immediately feeding that token to Umbral Collar Zealot's sacrifice ability, you trigger the Staff's untap ability. This allows Ulamog's Dreadsire to stand back up, ready to tap again while the Zealot's surveil effect helps dig through your deck.