Splinter Twin, Born to Drive, and Barrenton Medic

Prerequisites

• Splinter Twin on the battlefield
• Born to Drive on the battlefield
• Barrenton Medic on the battlefield
• Splinter Twin and Born to Drive attached to Barrenton Medic
• Barrenton Medic does not have summoning sickness

Steps

1. Activate Barrenton Medic by tapping it, creating a token copy of itself with haste
2. Activate Barrenton Medic by putting a -1/-1 counter on it, untapping it
3. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB
• Infinitely large Barrenton Medic