Barrenton Medic, Elemental Mastery, and Sigil of the Nayan Gods

Prerequisites

• Barrenton Medic on the battlefield
• Elemental Mastery on the battlefield
• Sigil of the Nayan Gods on the battlefield
• Elemental Mastery and Sigil of the Nayan Gods attached to Barrenton Medic
• Barrenton Medic does not have summoning sickness and has a power of one or greater

Steps

1. Activate Barrenton Medic by tapping it, creating at least one 1/1 Elemental creature token with haste
2. Activate Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it
3. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB