The Underworld Cookbook + Clock of Omens + Metalwork Colossus + Worldwalker Helm

Prerequisites

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Steps

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

Effects

• Infinite self-discard triggers