The Underworld Cookbook + Clock of Omens + Metalwork Colossus + Anointed Procession

The Underworld Cookbook

Clock of Omens

Metalwork Colossus

Anointed Procession

How it works

1. Activate The Underworld Cookbook's first ability by tapping it and discarding Metalwork Colossus, creating two Food tokens.
2. Activate Clock of Omens by tapping the Foods, untapping The Underworld Cookbook.
3. Activate Metalwork Colossus by sacrificing the Foods, returning it from your graveyard to your hand.
4. Repeat.