Kuldotha Forgemaster, Clock of Omens, Cauldron of Souls, and Threefold Thunderhulk

Prerequisites

• Kuldotha Forgemaster on the battlefield
• Clock of Omens on the battlefield
• Cauldron of Souls on the battlefield
• Threefold Thunderhulk on the battlefield

Steps

1. Activate Cauldron of Souls by tapping it, targeting Threefold Thunderhulk
2. Activate Clock of Omens by tapping Threefold Thunderhulk and the other creature that enters with +1/+1 counter(s), untapping Kuldotha Forgemaster
3. Activate Kuldotha Forgemaster by tapping it and sacrificing Threefold Thunderhulk, the creature entering with +1/+1 counter(s) and another artifact
4. When Threefold Thunderhulk and the other creature die, their persist abilities trigger, returning them from your graveyard to the battlefield
5. The -1/-1 counters placed upon them will be removed by the +1/+1 counter(s) placed on them as they enter the battlefield
6. When Threefold Thunderhulk enters, it triggers, creating two 1/1 Gnome artifact creature tokens
7. Resolve the Kuldotha Forgemaster ability, searching your library for an artifact card and putting it onto the battlefield
8. Activate Clock of Omens by tapping two Gnomes, untapping Cauldron of Souls
9. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers
• Put all artifacts from your library onto the battlefield