Carrion Feeder + Hardened Academic + Twilight Shepherd

RWB identity

Commander legal

The 3 combo pieces

• Carrion Feeder
• Hardened Academic
• Twilight Shepherd

How to execute it

1. Activate Carrion Feeder by sacrificing Twilight Shepherd.
2. When Twilight Shepherd 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 Twilight Shepherd.
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