Steel Overseer, Crystalline Crawler, and Pemmin's Aura

Prerequisites

• Steel Overseer on the battlefield
• Crystalline Crawler on the battlefield
• Pemmin's Aura on the battlefield

Steps

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

Results

• Infinite +1/+1 counters on all artifact creatures you control except Crystalline Crawler