Iron Spider, Stark Upgrade, Crystalline Crawler, and Pemmin's Aura

Prerequisites

• Iron Spider, Stark Upgrade on the battlefield
• Crystalline Crawler on the battlefield
• Pemmin's Aura on the battlefield

Steps

1. Activate Iron Spider by tapping it, putting a +1/+1 counter on each artifact creature and Vehicle you control
2. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding
3. Activate Pemmin's Aura by paying , untapping Iron Spider
4. Repeat

Results

• Infinite +1/+1 counters on all Vehicles you control
• Infinite +1/+1 counters on certain creatures