Gravelgill Axeshark + Hardened Academic + Phyrexian Altar

WUBR identity

Commander legal

The 3 combo pieces

• Gravelgill Axeshark
• Hardened Academic
• Phyrexian Altar

How to execute it

1. Activate Phyrexian Altar 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. Repeat.

What the combo produces

• Infinite colored mana
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers