Boonweaver Giant + Viscera Seer + Kaya's Ghostform

Boonweaver Giant

Viscera Seer

Kaya's Ghostform

How it works

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