Ulamog's Dreadsire + Thornbite Staff + Yahenni, Undying Partisan

Ulamog's Dreadsire

Thornbite Staff

Yahenni, Undying Partisan

How it works

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

This loop turns Ulamog's Dreadsire into a one-man token factory by bypassing its usual tapping restrictions entirely. With Thornbite Staff equipped, every time Yahenni, Undying Partisan sacrifices the freshly minted 10/10 Eldrazi token, the Staff's triggered ability untaps Ulamog's Dreadsire so it can immediately tap to make another. Meanwhile, Yahenni happily grows larger with each iteration while providing a safe outlet to keep the cycle churning.