Ertha Jo, Frontier Mentor, Clock of Omens, and Liquimetal Coating

Prerequisites

• Ertha Jo, Frontier Mentor on the battlefield
• Clock of Omens on the battlefield
• Liquimetal Coating on the battlefield

Steps

1. Activate Liquimetal Coating by tapping it, giving the creature with a tap trigger the artifact type
2. Activate Clock of Omens by tapping it and the creature with a tap trigger, targeting the creature
3. Ertha Jo and the creature trigger
4. Resolve the creature's trigger
5. Resolve the Ertha Jo trigger, copying Clock of Omens' ability, targeting Clock of Omens
6. Resolve both Clock of Omens abilities, untapping it and the creature tapped in step 2
7. Repeat from step 2

Results

• Infinite triggers from the creature with a tap trigger