Endless Cockroaches + Deathrender + Carrion Feeder

Endless Cockroaches

Deathrender

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing Endless Cockroaches.
2. Endless Cockroaches dies, triggering itself and Deathrender.
3. Resolve the Endless Cockroaches trigger, returning it from your graveyard to your hand.
4. Resolve the Deathrender trigger, putting Endless Cockroaches onto the battlefield from your hand, and attaching Deathrender to it.
5. Resolve the Carrion Feeder ability from step 1, putting a +1/+1 counter on it.
6. Repeat.