Cathars' Crusade, Nest of Scarabs, and Cinderhaze Wretch

Prerequisites

• Cathars' Crusade on the battlefield
• Nest of Scarabs on the battlefield
• Cinderhaze Wretch on the battlefield
• Cinderhaze Wretch does not have summoning sickness
• Cinderhaze Wretch does not have a -1/-1 counter on it

Steps

1. Activate Cinderhaze Wretch's first ability by tapping it, causing target player to discard a card
2. Activate Cinderhaze Wretch's second ability by putting a -1/-1 counter on it
3. Nest of Scarabs triggers, creating a 1/1 Insect creature token
4. The Insect enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control
5. Resolve the Cinderhaze Wretch ability from step 2, untapping it
6. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite +1/+1 counters