Boonweaver Giant + Umbral Collar Zealot + Unholy Indenture

Boonweaver Giant

Umbral Collar Zealot

Unholy Indenture

How it works

1. Activate Umbral Collar Zealot by sacrificing Boonweaver Giant
2. When Boonweaver Giant dies, Unholy Indenture triggers, returning Boonweaver Giant from your graveyard to the battlefield
3. When Boonweaver Giant enters, it triggers, returning Unholy Indenture from your graveyard to the battlefield attached to Boonweaver Giant.
4. Resolve the Umbral Collar Zealot ability from step 1.
5. Repeat.