Carrion Feeder + Hardened Academic + Persistent Constrictor

RWB identity

Commander legal

The 3 combo pieces

• Carrion Feeder
• Hardened Academic
• Persistent Constrictor

How to execute it

1. Activate Carrion Feeder by sacrificing Persistent Constrictor.
2. When Persistent Constrictor dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Hardened Academic triggers, putting a +1/+1 counter on Persistent Constrictor.
4. Resolve the Carrion Feeder ability.
5. Repeat.

What the combo produces

• Infinite +1/+1 counters on a creature
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers