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

Prerequisites

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

Steps

1. Activate Liquimetal Coating by tapping it, causing Kragma Butcher to become an artifact
2. Activate Clock of Omens by tapping it and Kragma Butcher, targeting Kragma Butcher
3. Ertha Jo triggers, copying Clock of Omens' ability, targeting Clock of Omens
4. Resolve both Clock of Omens abilities, untapping it and Kragma Butcher
5. Kragma Butcher triggers, giving it +2/+0 until end of turn
6. Repeat from step 2

Results

• Infinitely powerful creature until end of turn