Tawnos, Solemn Survivor, Breaching Hippocamp, and Krark-Clan Ironworks

Prerequisites

• Tawnos, Solemn Survivor on the battlefield
• Breaching Hippocamp in the graveyard
• Krark-Clan Ironworks on the battlefield
• available

Steps

1. Activate Tawnos's second ability by paying , tapping it and sacrificing two artifact tokens, exiling Breaching Hippocamp from your graveyard and creating a token copy of it that is an artifact in addition to its other types
2. When the Breaching Hippocamp token enters, it triggers, untapping Tawnos
3. Activate Tawnos's first ability by paying and tapping it, creating a copy of the Breaching Hippocamp token and causing you to mill two cards
4. When the Breaching Hippocamp token enters, it triggers, untapping Tawnos
5. Activate Krark-Clan Ironworks by sacrificing a Breaching Hippocamp token, adding
6. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite self-mill