Cogwork Assembler, Crystalline Crawler, Doubling Season, and Cathars' Crusade

Prerequisites

• Cogwork Assembler on the battlefield
• Crystalline Crawler on the battlefield
• Doubling Season on the battlefield
• Cathars' Crusade on the battlefield
• available

Steps

1. Activate Cogwork Assembler by paying , creating two token copies of Crystalline Crawler with haste
2. Cathars' Crusade triggers twice, putting four +1/+1 counters on each creature you control
3. Activate the first activated abilities of any Crystalline Crawlers eight times by removing eight +1/+1 counters from them, adding eight mana of any color
4. Repeat

Results

• Infinite +1/+1 counters
• Infinite colored mana
• Infinite copies of artifacts
• Infinite creature tokens with haste
• Infinite ETB