Boonweaver Giant + Viscera Seer + Unhallowed Pact

Boonweaver Giant

Viscera Seer

Unhallowed Pact

How it works

1. Activate Viscera Seer by sacrificing Boonweaver Giant
2. When Boonweaver Giant dies, Unhallowed Pact triggers, returning Boonweaver Giant from your graveyard to the battlefield
3. When Boonweaver Giant enters, it triggers, returning Unhallowed Pact from your graveyard to the battlefield attached to Boonweaver Giant.
4. Resolve the Viscera Seer ability from step 1.
5. Repeat.