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

Infinite self-discard triggers

The Underworld Cookbook

Clock of Omens

Metalwork Colossus

Exalted Sunborn

Activate Bootleggers' Stash by tapping it, as it's a land due to Toph, creating two Treasure tokens due to Exalted Sunborn.
Activate Clock of Omens by tapping the Treasures, untapping Bootleggers' Stash.
Repeat.

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