Carrion Feeder + Gravelgill Axeshark + Hardened Academic

WUBR identity

Commander legal

The 3 combo pieces

• Carrion Feeder
• Gravelgill Axeshark
• Hardened Academic

How to execute it

1. Activate Carrion Feeder by sacrificing Gravelgill Axeshark.
2. When Gravelgill Axeshark 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 Gravelgill Axeshark.
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