Cathars' Crusade + Devoted Druid + Nest of Scarabs

Cathars' Crusade

Devoted Druid

Nest of Scarabs

How it works

1. Activate Devoted Druid's first ability by tapping it, adding .
2. Activate Devoted Druid'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 Devoted Druid ability from step 2, untapping it.
6. Repeat.