Koll, the Forgemaster + Deathrender + Viscera Seer

Koll, the Forgemaster

Deathrender

Viscera Seer

How it works

1. Activate Viscera Seer by sacrificing it.
2. When Viscera Seer dies, Koll and Deathrender trigger.
3. Resolve the Koll trigger, returning Viscera Seer from your graveyard to your hand.
4. Resolve the Deathrender trigger, putting Viscera Seer from your hand onto the battlefield and attaching Deathrender to it.
5. Resolve the Viscera Seer ability from step 1, causing you to scry 1.
6. Repeat.