Cathars' Crusade + Nest of Scarabs + Cinderhaze Wretch

Cathars' Crusade

Nest of Scarabs

Cinderhaze Wretch

How it works

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.