The Underworld Cookbook + Clock of Omens + Metalwork Colossus + Peregrin Took

The Underworld Cookbook

Clock of Omens

Metalwork Colossus

Peregrin Took

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.

This clever loop transforms The Underworld Cookbook from a humble recipe book into a relentless engine by leveraging the token-multiplying replacement effect of Peregrin Took, which ensures that discarding your Metalwork Colossus produces a pair of Food tokens instead of just one. With those two newly minted artifacts in play, Clock of Omens steps in to tap them both and instantly untap The Underworld Cookbook, resetting the whole process while generating the exact artifact fodder needed to fuel Metalwork Colossus's own graveyard-retrieval ability. By cycling the Colossus back and forth between your hand and the graveyard, you generate an infinite stream of self-discard triggers to fuel whatever madness or graveyard strategies you desire.